Well in some cases, you can blame the white people. In this particular case, I saw a protest by black people and they were all in front of the police station saying f the police and feeling happy about that. Antifa comes in with a bunch of chubby white kids and they start attacking things, and the black guys shut them down. Most of the people looting are just taking advantage of the situation, free stuff cops are busy.
Turns out the guy they murdered had an armed robbery charge a while ago, so probably wasn't like the nicest guy in the world, but still wrong to kill someone by suffocating them with your knee.