Only because we were fortunate enough that the culture that ended up banning it won out. In fact we are lucky that Western culture took this path at all.

Well, I agree. I just am surprised that its condemnation seems rather....muted in some of these replies.

Right or wrong is relative. Including slavery.

Wow that's super progressive. I'm not one for cultural relativism though, I'm afraid. I'm quite the reactionary, unenlightened provincial bore, with my outmoded beliefs like "slavery is unjustifiable".

It's just about whether you believe in equality and freedom or not.

Yes, not all human care or believe in that.