[alextp]

> But you do know that blacks commit a lot more crime (~ 10x) everywhere

I don't understand why this rules out cultural reasons. In most of the places where black people live today outside africa their immigration was mainly based on slavery and subjugation, and this comes with a really heavy cultural baggage both for the black people themselves and for the rest of the local society. And racial slavery took a few centuries to fade away, which helped build a lot of other sociological prejudices and rituals around it. At least here in brazil this is pretty obvious. That's very different from jewish immigration worldwide (based on commerce and a looser form of persecution), mexican immigration in the united states (also marginalized, but far less), asian immigration, etc. You can't discount these factors.

I've never been to africa, so I can't say why (and if) this phenomenon happens there, but I think european imperialism and colonialsm might be a good place to start looking for a reason. Before you think I'm a liberal nut, if the structure of a society was built for a long time around foreign domination, most people living in it will adapt to it. Inferiority complexes are hard to overcome, even discounting factors such as ghetto areas, bad infrastructure, and the "social inertia" that makes it easier to raise traumatized kids if you've been traumatized yourself.