Senseless violence is, almost by definition, hard to understand. Not that I can

Senseless violence is, almost by definition, hard to understand. Not that I can understand terrorists who kill from hate, but at least we can identify a reason – a terrifying one, to be sure, grounded in a violent belief system – for what they do. Two gangs go to war. Extremists kill in the name of belief.
– Susan Estrich –