As the world decries Israel's attempt to defend itself from the rocket attacks coming from Gaza, consider this: When Hamas routed Fatah in Gaza in 2007, it cost nearly 350 lives and 1,000 wounded. Fatah's surrender brought only a temporary stop to the type of violence and bloodshed that are commonly seen in lands where at least 30% of the male population is in the 15-to-29 age bracket.

In such "youth bulge" countries, young men tend to eliminate each other or get killed in aggressive wars until a balance is reached between...