You quite literally just mischaracterized the riots of that time period as being caused by black people. Yes that is absolutely racist against black people and not true.
The seriously violent groups are those that usually call themselves anarchist associated, and those groups are much more white than other groups.
We've banned this account for egregiously and repeatedly breaking the site guidelines, including by posting flamewar comments and personally attack other users. That's abusive, and you've been doing a lot of it. Not cool, regardless of your political persuasion.
If you don't want to be banned, you're welcome to email hn@ycombinator.com and give us reason to believe that you'll follow the rules in the future. They're here: https://news.ycombinator.com/newsguidelines.html.
The seriously violent groups are those that usually call themselves anarchist associated, and those groups are much more white than other groups.