You've completely missed a very crucial point here. Nobody planned this. Nobody woke up one day and said you know what, NOW would be a great time for nationwide protests!
The people were stretched to their breaking point, George Floyd was killed on camera, and they snapped. Are you suggesting that they should have all said whoa, whoa. I know we're all enraged at the unjust killing of another member of our community, and nothing we have done so far to try to bring attention to this problem has worked, but we should all take a breath and stay inside and wait until conditions for protesting improve...
Nobody wanted this, it just happened. It wasn't planned. It was time. If you want to blame someone for the timing, blame Derek Chauvin.