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Syria is controlled by Alawites who follow a specialized, somewhat secretive religion. This religion is often described as "shiite muslim," but that is a gross oversimplification. The Alawites have friendly, although sometimes uneasy, association with not only the Maronites, but with other Christian and non-Christian minorities including the Druse and others. As a minority in their own country the Alawites have to ally with many other groups, one of which is the Maronites.
The dynamics of the war against the Maronites, like most wars, was complicated and describing it as just an attack by the PLO overlooks many other facets.
The bottom line is that Syria does not want a situation in Lebanon in which there is a radical Sunni hegemony. They want a diverse polity that includes the Maronites and recognizes and is friendly to the Alawites. The PLO and other Sunni radicals were threatening that balance, which explains the intervention.
Upvote:0
I am reading the same book you are refering to. There is another reason as well why this is perplexing. My impression from reading the book is that the non-Christian population supported reunification with Syria, so it would seem that Syria would have had an interest in supporting those who would want to be part of Syria. One possible explanation I can think of is that they did not want the PLO to become to powerful, as they might destabilize Syria in the same way that they were destabilizing Lebanon, and as they had earlier destabilized Jordan. I posted a similar question as this on another site.
One answer I got there was that the Maronites were fighting on the same side as the Shia population in the south. I have never read about this before.
Upvote:3
The Maronites were themselves divided and some elite families engaged in Mafia style gang-wars to control valuable smuggling routes. Suleiman Frangieh - not only a notorious Maronite war-lord and Gang Boss, but also a President of Lebanon, had become close friends with the Assads (who took control of Syria). He invited the Syrians in to Lebanon. His son was killed by Maronites, not Muslims, and he relied on the Syrians to take revenge.