General Discussion
In reply to the discussion: The excuse making for ISIS here is insane [View all]MH1
(19,267 posts)regarding the consequences of the Iraq invasion.
A consequence was that a whole lot of military or police trained (such as it was) youngish adult men were left unemployed by "debaathification" and also lots of military weaponry was left unsecured or they already had it in their possession. No work, no real security in the country, and these people with nothing but time on their hands, weapons, and anger. Sure a lot of what they are doing has nothing directly to do with anger at the US, but we put a lot of people out there ripe for the pickin' by the extremist groups, and ready for brainwashing.
So I don't think it's where the ISIS ideology came from at all - in that I agree with your OP - but I do think they gained a lot of recruits, and therefore power, from the consequences of the Iraq invasion.