Not only have they failed, the riots are continuing in part *because of the techniques used*. They have undermined the core principle of control; de-escalation.
What now occurs in Hong Kong will be a trial by fire, and the tech and data driven solution is failing in the worst way it can.
Capitalistic surveillance is a failure as a product. It will continue to be used because it's profitable.
Support the rioters. Listen to their demands. They are the front of a worldwide cultural war.