Those are not similar events. All of them have been condemned and appear to have largely been driven by individual reckless actors. Excuses about police believing they were under fire are dubious, but the fact that the excuses indicates the mentality behind how these actions are viewed (not ok).
Police brutality is a serious problem. But it’s not the same problem as those enabled the TS massacre.
> The US doesn't need to suppress people from talking. There's enough social control that people don't talk in the first place. The information is all out there and technically public, which against the US populace is more effective in making sure people don't think of the police as they should.
Anti police sentiment is a huge national issue.