And it's not as if their anger is new either Dazzle. They have hated the west since the middle ages and have continually tried to conquer Europe well into the 1500s.
They keep updating their excuses, but you're pretty much right. People who are unwilling or unable to get out of their own way are usually very angry, and looking for somebody else to blame is a great way of accepting any responsibility for improving your own situation. We see it domestically and on the foreign stage. Pathetic, really, and the encouragement of this thinking is very harmful.
Nah, the excuses are pretty much the same. Divide, conquer, convert and kill anyone who disagrees. That's why I always describe Islam as the "religion of death".