I remember when this happened in the 1970s, and the neighborhood I lived in suddenly got an influx of mentally ill people who had no idea what to do with themselves. They would hang around the liquor store panhandling until they got enough money to buy some Mad Dog 20/20 and medicate themselves into oblivion, staying inside the laundromat to stay warm.
One fellow I recall regularly got beaten up either by his fellow homeless or perhaps locals trying to get him to relocate somewhere else. He never did. He didn't have a clue.
Flas forward 45 years later. The wife and I are downtown doing a little sightseeing. We're getting ready to leave Five Guys when we see this scary-as-shit homeless dude looking at his reflection in the glass, stooping and swinging his arms. We waited until he moved on before exiting, but there he was again, only a few stores down, still having that stare-down with his reflection. we walked around him, me making sure I was between him and the missus in case he went nuts. It was a very tense few minutes.
So, what greater good is served by letting this guy do what he does?