A zebra is often bitten by a herd mate, but it sticks with the herd because a lion quickly eats it if it leaves. Monkeys and elephants stick with their groups despite harsh domination because their young are eaten alive if they leave. Even lions and wolves stick with their groups because their meals are stolen by rival packs if they go it alone. Gangs, like herds, stick together despite enormous internal aggression because they fear external aggression even more. A gang needs the aggression of rival gangs to keep up the safe feeling associated with membership. Oxytocin makes it feel good to be
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