Maybe not pay attention at all unless something actually happens. You have no clue what that person is doing and it's not your business.
My family’s safety is more important than some rando’s feelings of acceptance and comfort.
If you witness an assault, yea go ahead.
It's quite unfortunate that we've gotten to a point whereby some rather nebulous terms such as "freedom of movement" ha gotten in the way of crime-prevention.
For all we know, keeping people from committing crimes by removing their ability to would actually keep them honest and force them to improve their lot. Unfortunately, it's an uncomfortable conversation that touches on police-state territory, so we probably won't have it in the public eye any time soon.