ISIS must be LOLing their faces off right now at all of the apologists yelling, "If America and the rest of the west hadn't treated Muslims so poorly, none of this would have happened!"

As already mentioned here, ISIS' goal seems to be ruling their region and establishing a hard-line Islamic fundamentalist regime.

ISIS is using past "mistreatment" of Muslims as propaganda to get recruits, but that's not at all a requirement to recruit. It's just an easy and convenient way to go about it. As they control the message, ISIS can recruit in many ways, including lying about conspiracies to wipe out Islam or claims that the west's decadent ways are taking over the world and infecting humanity like a virus.

It's a huge stretch to claim, "Because we did X in the past, now ISIS is doing Y."

Islamic fundamentalist groups are all about power and religious fanaticism, and are not peace-loving people who are just fighting back. They would be attacking us regardless, and their recruits are confused or hopeless souls who could have otherwise been brainwashed in so many different ways.