"Cruel and barbaric" is not necessarily a drawback to everyone. History shows it's not much of a deterrent at all. Unfortunately. EDIT: I think the real cause

"Cruel and barbaric" is not necessarily a drawback to everyone. History shows it's not much of a deterrent at all. Unfortunately. EDIT: I think the real cause behind slavery is not and has never been "controlling war prisoners". It's personal profit. War raids between small tribes to capture "wives" from outside their local gene pool is one such, well-document example.