I don't want to understand it; I just want to kill it (radical Islam). Trying to understand the roots of radical Islam is like trying to understand why someone would rape a 6 month old child. You can’t make sense of something that makes no sense or rationalize the irrational. Some chalk it up to defective minds but I believe there are evil people in the world.
BTW, if I was to believe your premise “the fact that there's little social mobility, opportunity, or hope in those societies, and you have a recipe to create people who ain't afraid to die for a cause BECAUSE THEY DON'T HAVE MUCH TO LIVE FOR.” Then the Ethiopians should be the most blood thirsty group of people on earth. Right?