As the partial owner of a used bookstore, I can relate.
As the partial owner of a used bookstore, I can relate.
So report him. I'm serious - there's surely an agency you're supposed to give such reports to, and it's no doubt very easy to do so because they want crazies with guns reported. So flood them with reports from lots of people about him. See what happens - it might at least get annoying enough that it ends up a news item.