My university has a thing where everyone is supposed to be wearing a badge that is visible. So far I have not complied. I think a lot of that sort of thing is knee jerk over reaction. And since it is extremely and unnaturally dangerously cold here today - I would not begrudge a homeless person an attempt at being warm.
There was an md at a hospital where I was appointed to represent the alleged incapacitated for mental health holds and this guy got clocked by someone almost every single day. It got so the atty representing the md/hospital made more fun of him than I did. They even took up a collection to give him lessons in how to duck. I don't know if the md found it funny but the judge and I did.