The conflict wracking the modern world is not, I think, best understood as a “clash of civilizations,” if that proposition means we’re-different-so-we-must-fight-until-there’s-only-one-of-us. It’s better understood as the friction generated by two mismatched world histories intersecting. Muslims were a crowd of people going somewhere. Europeans and their offshoots were a crowd of people going somewhere. When the two crowds crossed paths, much bumping and crashing resulted, and the crashing is still going on.