One word: PORN.
Seriously, between the lack of women’s rights and lack of smooth female skin to look at (ankles and eye sockets do NOT count), many of these guys probably just said “You know what, fuck it. Let’s blow other people up. If we can’t have some sexy fun in the sun, then no one else should either. Fuck you all, by Allah! I’m gonna join the Muslim Extremists. At least in the afterlife I’ll MAYBE finally get some totally hot action!”
Forget nukes and cluster bombs… if we’d bombed Iraq with Playboys, Hustlers, and Juggs magazines, the war would have been over by now. Think about it. Those wannabe terrorist Martyrs would have been too busy jerking off and practicing good sex with their wives to blow themselves up.