It was not by accident[1] - remember the police force was on the wrong side of that consensus. Strategically, allowing and even encouraging[2][3] violence is a winning move for the police (as long as their members are relatively safe) - both to punish the communities who have seemingly "turned against the police" and to change the narrative so that the same communities beg the police to save them from the violence.
1. Twitter thread on how the Minneapolis police is on "strike" https://twitter.com/lynnellmick/status/1266489804444721152
2. https://twitter.com/JoshuaPotash/status/1267670804696895488
3. https://twitter.com/realDavidOnline/status/12673136333918699...