How voluntary is original sin in Adam's descendants?

Per Nigel we all (I), individually, can realize that (I) we've sinned voluntarily personally. Whether 'exactly like' Adam or 'not after the likeness of Adam’s transgression,' Rm 5:14. Which makes the question of 'original sin' moot in a way.

Paul--For just as through the disobedience of one man the many were constituted sinners, 5:19; and Augustine--human beings are born evil as a result of the bond of original sin--spoke of sin as involuntary biological inheritance. That's Augustine's 'original sin' coined phrase.

But Thomas and New Wiki appear to either change, or not have, that awareness. They talk about representativeness, a representative head. Which equates to a juridicial or merely legal discussion of Adam's sin and our sin. Which could be called 'original guilt' or 'original shame.' Which is a nonreality. We're not guilty of Adam's act. Adam didn't pass on guilt to us, directly. But indirectly, because he directly, biologically, passed on sin as a life, an element, a disease, lust. Though not medically curable.

So calling 'original sin' voluntary might make sense in their own definitions, but it's a fallacy in Augustine's and Paul's 'term.' I take the CCC phrase to properly fit Augustine.

In regard to the racial shaming matter, since slavery was 'the law,' in may be hard to blame master descendants or get their reparations involuntarily. Maybe they'll do so voluntarily. But as to (southern) governments, that deliberately violated the 14th and 15th Amendments by denying blacks their civil rights--just like US government violations of its own treaties with Native Americans--it seems reparations are called for if they can be quantified.

Yes, St. Thomas discusses this question in De Malo q. 4 a. 1 "Whether Any Sin Is Contracted by Way of Origin (ex origine)?" (Latin) arg./ad 1:

1. It is said in Ecclesiasticus (15, 18) “Before man is life and death, good and evil, that which he shall choose shall be given him,” from which it can be understood that sin, which is the spiritual death of the soul, depends upon the will. But nothing that man contracts by way of his origin depends upon his will. Therefore man contracts no sin by way of origin.

Reply to 1. The sin that is contracted by way of origin is called voluntary by reason of its principle, namely, the will of the first parent, as we have said (in the Response).

Commenting on Romans 5:12 ("Wherefore as by one man sin entered into this world, and by sin death; and so death passed upon all men, in whom all have sinned."), St. Thomas addresses the "difficulty" that

defects traced to a vitiated source do not involve guilt. For they are not deserving of punishment but rather of pity, as the Philosopher says of one born blind or in any other way defective. The reason is that it is the character of guilt that it be voluntary and in the power of the one to whom the guilt is imputed. Consequently, if any defect in us arose through origin from the first parent, it does not seem to carry with it the nature of guilt but of punishment.

Therefore, it must be admitted that as actual sin is a person’s sin, because it is committed through the will of the person sinning, so original sin is the sin of the nature committed through the will of the source of human nature.

Ibid. n. 410.2 gives the analogy of how the body parts of a sinner share in the guilt of the sinner (e.g., a killer can't say: "I didn't kill; my hand did!" or "I did kill; but my hand that pulled the trigger didn't."):

Furthermore, the act of sin performed by a member, say the hand or the foot, does not carry the notion of guilt from the hand’s or foot’s will but from the whole person’s will, from which as from a source the movement of sin is passed to the several members. Similarly, from the will of Adam, who was the source of human nature, the total disorder of that nature carries the notion of guilt in all who obtain that nature precisely as susceptible to guilt. And just as an actual sin, which is a sin of the person, is drawn to the several members by an act of the person, so original sin is drawn to each man by an act of the nature, namely, generation. Accordingly, just as human nature is obtained through generation, so, too, by generation is passed on the defect it acquired from the sin of the first parent.