Posting this seperately: OP, you have a right to feel unsafe. Talk with your other coworkers, then go to managment with a safety plan. You probably can’t get this guy fired, but it’s completely reasonable to ask for some sort of safeguards, given he’s a multiple offender. If you need inspiration, look at the sort of practices medical facilities have: multiple people required to be in the room, clear boundaries being set, agreed-upon followup if rules are broken, etc.