I disagree -- it is twisting. There is a whole world of difference between "natural" (or perhaps "expected" would be a better choice of word) and "OK". We shouldn't be surprised by these riots, partly because there are always opportunist louts looking for any excuse to go berserk, and partly because there is a clear sense of "us v. them" in the US between (mainly white) police and the Black communities they are policing. We should be appalled by these riots all the same. The solution, if there is one, comes from understanding the root cause. I should say, the root causes, because we can never do away with riots entirely, and I mentioned examples that show people can indeed riot almost for the sake of it. Such behaviour will never really go away. But the second root cause, deep-seated enmity between police and black people, requires a serious change of attitudes on both sides.
I expect that things are only made worse by the easy introduction of guns, but it's hard to see that argument going anywhere in the US. Still, if you insist on throwing such a lethal weapon into all such tense situations, small wonder that people end up killed with appalling regularity. In the US, in seven-year period up to 2012, about 400 people a year were killed by police; about 25% of these victims were black people killed by white cops, apparently. And, according to my source, the data is drawn from less than 5% of all US law enforcement agencies, so this figure is likely to be a gross underestimate of all police-caused fatalities.
It is a legitimate grievance, anyway, when people of your skin colour are disproportionately likely to be arrested, shot, killed, imprisoned. The response, rioting, is wholly unacceptable, but if you don't accept that the reasons partly behind the riots are legitimate then nothing will change. And things have to.