Well said. We're living in terrifying times, and I worry that the violent reaction to this, which always comes from a minority, as most protestors are peaceful, will be used to bring in more restrictive laws and controls. It's great that people are rising up and saying "enough is enough" because that's the only way that things are going to change.
I was quite astonished to see Obama's moralising tweet speaking out against the police murder, because there were lots of police killings during his eight-year term, and I don't remember him speaking out much against any of them... Or maybe I just missed his angry words condemning police violence when he was President because I live in Scotland??