if there was no islam, these people would just use another crutch.
you are putting the horse before the cart.
The problem is humans, and islam, or any other religion, is just what they use to justify their actions and rope the vulnerable and disenfranchised into their net of deceit.
If all other things were exactly how they are now, except the capitalist and colonialist west were mainly Muslims and the middle east were Christians, would anything change?
There was a point in history where the islamic world were the more culturally, scientific and medically advanced, while the Christian hordes were little more than uncivilised barbarians who put a concerted effort into destroying the islamic world.
The problem has always been and always will be humans themselves. Blaming anything else is just denial of human nature.