Thanks for the thoughtful answers
But what would you say to someone who says blacks are genetically more prone to violence and impulsivity? You are probably familiar with the discussions on black vs white time preference. All those chimpouts in public areas, are they just a cultural phenomenon or connected to being poor? And regardless of these factors, racial animus does exist, therefore a lone white may become prey in a black gatherings. Do you "believe" in IQ and do you believe it affects many life outcomes, even health and longevity? If you do what do you think the reason is for the black vs white disparity (85 in African Americans, 100 in white Euros)? It hasn't changed despite lots of social programs and efforts with school. I'm a big believer in genetics, I believe the pages of our lives are mostly written when we are born. You don't have to answer, I'm just curious as always about how smart people view things 
IQ certainly plays a part, but I also agree with Jeff that culture (and in my opinion, economic class) has a lot to do with it. This will be a bit disjointed, but it will get somewhere.
For a majority of Blacks, the White will always be the Devil. It's not going to change, I didn't notice it as a kid, but as we grew up I could see it develop. Now to how much they hate or blame you, it varies, but make no mistake any Black troubles still lead to the White man for most.
Culturally, the Blacks more than any other race don't have the ability to step back and occasionally take a loss. For some it might be IQ based, but for many it's cultural. You can't be seen as a punk or gotten over on, so any grievance must be addressed. This also goes along with economic class, especially in urban areas. In poor areas, there is always a predator and prey thing happening. Once you're seen as weak, you're done. They're stealing your shoes this week, your coat the next, etc....
Another thing that has happened at least in the States, is the levels of violence that Blacks accept has grown. Growing up there was always some nasty violence, but for most things, a bad fist fight was as high as it went. It simply got more acceptable among the Blacks to go straight to guns.
Also amongst a lot of Blacks, I've noticed a stunted sense of Empathy, especially the last few decades. If you can't feel empathy for someone else, then it becomes much easy to destroy or kill. I'm not going to blame that on IQ. Much of that is socio-economic. The Blacks I know that grew up in somewhat stable middle class families don't have these problems.
Anyway, as I look at this wordy vomit, I guess what I'm saying is that it boils down to a whole pie chart of things rather than just a few. Also, this is just what I see in the US.