Ignorance and the root of suffering?

In AN 3.69 (Akusalamūlasutta) it's defined as one of the three "unskillful roots".

And I think that earns it its place at the centre of the wheel of life -- maybe not in Theravada though:

The Theravada-tradition does not have a graphical representation of the round of rebirths, but cakra-symbolism is an elementary component of Buddhism, and Buddhaghosa's Path of Purification (Visuddhimagga) contains such imagery:

It is the beginningless round of rebirths that is called the 'Wheel of the round of rebirths' (saṃsāracakka). Ignorance (avijjā) is its hub (or nave) because it is its root. Ageing-and-death (jarā-maraṇa) is its rim (or felly) because it terminates it. The remaining ten links (of the Dependent Origination) are its spokes (i.e. karma formations [saṅkhāra] up to process of becoming [bhava]).

That quote is on/from page 188-189 of The Path of Purification:

In context, I guess that Buddhaghosa derives that from its position as the first of the 12 nidanas.

There's also doctrine in the Abhidhamma, for example from of A Comperehensive Manual of Abhidhamma edited by Bhikkhu Bodhi:

(1) Delusion (moha): Moha, “delusion,” is a synonym for avijjā, “ignorance.” Its characteristic is mental blindness or unknowing (aññāṇa). Its function is nonpenetration, or concealment, of the real nature of the object. It is manifested as the absence of right understanding or as mental darkness. Its proximate cause is unwise attention (ayoniso manasikāra). It should be seen as the root of all that is unwholesome.

Or page 31 of A Manual of Abhidhamma by Narada Maha Thera:

Three Roots (Mula)

Lobha, dosa, and moha are the three roots of evil. Their opposites are the roots of good.

Lobha, from √ lubh, to cling, or attach itself, may be rendered by ‘attachment’ or ‘clinging’. Some scholars prefer ‘greed’. Craving is also used as an equivalent of lobha.

In the case of a desirable object of sense, there arises, as a rule, clinging or attachment. In the case of an undesirable object, ordinarily there is aversion.

In Pàli such aversion is termed dosa or pañigha. Dosa is derived from √ dus, to be displeased. Pañigha is derived from ‘pañi’, against, and √ ‘gha’ (han), to strike, to contact. Illwill, hatred are also suggested as equivalents of ‘pañigha’.

Moha is derived from √ muh, to delude. It is delusion, stupidity, bewilderment. It is ‘moha’ that clouds an object and blinds the mind. Sometimes ‘moha’ is rendered by ignorance.

According to the Abhidhamma, moha is common to all evil. Lobha and dosa do not arise alone, but always in combination with moha. Moha, on the other hand, does arise singly—hence the designation ‘momåha’, intense delusion.

Diametrically opposed to the above three roots are the roots of Kusala. They not only indicate the absence of certain evil conditions, but also signify the presence of certain positive good conditions. Alobha does not merely mean non-attachment, but also generosity. Adosa does not merely mean non-anger or non-hatred, but also goodwill, or benevolence, or loving-kindness (mettà). Amoha does not merely mean non-delusion, but also wisdom or knowledge (nana or pannà).

It is true that craving, feeling, contact, and ignorance are impermanent, conditioned, and dependently originated. Coming together of Ignorance and Contact gives rise to Craving which in turn gives rise to Suffering. If we abandon Ignorance or Contact or Craving or Feeling completely, the Suffering will cease. Therefore in a sense all of the above factors of dependent origination can be called the root of suffering.

The question requires understanding exactly what the word "mūla" ("root") is meant to mean in terms of its general usage (which I cannot answer at this current time and requires a contextual analysis of the texts). However, given "attachment" actually is suffering itself, the word "root" may not mean a "preceding cause" ("hetu") but be something much closer to the subject/thing.

Delight in feelings is attachment - MN 38

In short, suffering is the five aggregates attached to - SN 56.11

Conceiving 'self' is an arrow, disease, cancer - MN 140

Resolved on 'my self'... is suffering arising... SN 12.15

View of 'a being'... is suffering arising... SN 5.10

In SN 42.11, 'root' is used as a preceding cause; although 'chando' is not as exact as 'tanha':

For desire is the root of suffering. Chando hi mūlaṃ dukkhassa.

In MN 22, something that is essentially 'causeless', namely, ignorance, is cut off at its root:

Herein the monk has abandoned ignorance, has cut it off at the root..

Abandoned the round of re-births, leading to renewed existence; he has cut it off at the root...

Abandoned craving, has cut it off at the root...

Abandoned the five lower fetters, has cut them off at the root...

Abandoned the conceit of self, has cut it off at the root...

The contextual analysis becomes more clear with SN 15.9, which says:

Suppose a stick was tossed up in the air. Sometimes it’d fall on its bottom, sometimes the middle, and sometimes the top.

Seyyathāpi, bhikkhave, daṇḍo uparivehāsaṃ khitto sakimpi mūlena nipatati, sakimpi majjhena nipatati, sakimpi antena nipatati;

Therefore, as I suspected, the word "mūla" might be closer to the subject/thing itself than being a distant preceding cause. In SN 15.9, it is the "bottom/base" of a stick (rather than a more distant cause, such as tree, tool or carpenter that made the stick). This appears apparent in SN 4.24 which says:

“Having dug up entirely the root of sorrow, Guiltless, I meditate free from sorrow. Having cut off all greedy urge for existence, I meditate taintless, O kinsman of the negligent!”

Again, Snp 4.14 is about a very close cause rather than a distant cause:

One should completely extract the root of proliferation and reckoning— The notion, “I am the thinker”.

AN 10.58 says:

Wholesome zeal (chanda) is the root of all dhamma practise.

This says without zeal (chanda), dhamma practises will be ineffective, similar to how a car cannot drive without fuel.

I think 'mūla' is a characteristic or cause of a thing that is very closely tied to the thing. Therefore, 'ignorance' is probably too distant a cause to be the 'mūla' of suffering because what makes suffering burn is the craving, attachment & egoism.

Therefore, the "root" or "base" of suffering is craving & delight. The "trunk" of suffering is "becoming & ego-birth". The "branches & leaves" of suffering are "ego-aging-death, sorrow, lamentation, pain, grief & despair".

"Ignorance" is the first cause/leader of all unskilful qualities, which includes attachment.

Avijjā, bhikkhave, pubbaṅgamā akusalānaṃ dhammānaṃ samāpattiyā..

Monks, ignorance is the leader/foreunner in the attainment of unskillful qualities...

SN 45.1

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Purimā, bhikkhave, koṭi na paññāyati avijjāya: ‘ito pubbe avijjā nāhosi, atha pacchā samabhavī’ti

Bhikkhus, this is said: ‘A first point of ignorance, bhikkhus, is not seen such that before this there was no ignorance and afterward it came into being.’

AN 10.61

Let me introduce you to the old South Indian Monkey Trap (from this article):

In Zen And The Art Of Motorcycle Maintenance, Robert Pirsig’s bonkers-but-brilliant philosophical novel that turns 40 this year, he describes “the old South Indian Monkey Trap”. ... The trap “consists of a hollowed-out coconut, chained to a stake. The coconut has some rice inside which can be grabbed through a small hole”. The monkey’s hand fits through the hole, but his clenched fist can’t fit back out. “The monkey is suddenly trapped.” But not by anything physical. He’s trapped by an idea, unable to see that a principle that served him well – “when you see rice, hold on tight!” – has become lethal.

The monkey needs to let go of the rice in order to free himself from his suffering. The way to end his suffering, is to end his craving for rice. He got stuck in the trap in the first place due to his craving for rice.

But in order to end his craving for rice, he must first understand how his hand is stuck inside the coconut. When the monkey overcomes his ignorance about how the trap works, he would let go of his craving for rice, and release his clenched fist. With this, he would be free from his suffering.

So, the root of the monkey's misery is craving, and not ignorance, as stated in SN 22.31:

“And what, bhikkhus, is misery? Form is misery; feeling is misery; perception is misery; volitional formations are misery; consciousness is misery. This is called misery.

“And what, bhikkhus, is the root of misery? It is this craving that leads to renewed existence, accompanied by delight and lust, seeking delight here and there; that is, craving for sensual pleasures, craving for existence, craving for extermination. This is called the root of misery.”

But to uproot craving, the monkey must first overcome his ignorance.

If the monkey had ignorance of the working of the trap, but if he had no craving, he would not get stuck in the trap. If the monkey had craving but did not have ignorance, he could still neglect his knowledge and get caught in the trap, due to greed and clinging. Hence, craving is the root of suffering, and not ignorance.

(Illustration above: Paul Thurlby for the Guardian)