He was free to put them up and the other person was free to remove them. Nothing more, nothing less. He can't and shouldn't be arrested for exercising his first amendment rights, eh?
They, (neo nazis), had a march in my parents’ home town a few years ago, I couldn’t believe how many of them there were. It’s kind of amazing, but turning them starts with open dialogue I suppose, people have haven’t they? The man approaching was brave to try I suppose.