I simply don't agree with the massive general violence and looting going on at the moment. That must be stopped. And police officers attempting to do so are being beaten to death. Some are also being shot while trying to prevent looting. I disagree that all police should pay for one person's crime.
However, I think that the situation is so difficult, that society is incapable of finding a real helpful solution and as injustice keeps being comitted by police across the country, the emotions find a channel to break out.
How long can they violently treat citizens without consequences? The negative energy just seems to burst out here and it appears to be the natural consequence (which doesn't make the looting right, but maybe explains the negative energy a little bit).