WTF. I’m so sorry. This is terrifying. There’s no way to know how a violent person might react if you tried to intervene, he could escalate the violence. The fight/flight/freeze primitive brain is usually very good at making the right choice, otherwise we would have died out as a species. I think mental institutions are not always a bad thing. Nobody benefits from this guy being on the street. Not him, not his victims, not the police, not the bystanders. There must be a better way.