A few points I'll try to address quickly:
--The "rioting" is spontaneous and not coordinated by BLM. Important point. BLM presses for racial justice through the normal political process and non-violent means. They're not the arch-masterminds of "riots" and they're certainly not a terrorist group as many conservatives have now been taught to believe.
--The fixation on rioting to the exclusion of the much greater mass of peaceful protests is misplaced.
--To the extent "rioting" has occurred, it's the result of people feeling desperate and pushed to their limit. It's ignited by discrete events of injustice. As MLK explained decades ago, the best and indeed only way to ensure riots don't happen again is to actually fix the problems. Telling people to sit down and shut up has a poor track history, and in the end, "solutions" in that vein can only be effectuated through force.
All that said, your comments aren't unreasonable compared to the dude who inspired this meme who offered that police brutality protestors (and even their "supporters!") should be "eradicated" a la Tiananmen Square or the Holocaust.