We've seen what they do in supermarkets, convenience stores, restaurants, and in public. There are countless video examples everywhere. That we have to nonchalantly treat an entire class of people like Hannibal Lector instead of actually mentioning the problem out loud really speaks to the actual privilege they're afforded as any sane society would just let hem rot where they are instead of going the extra mile to pretend they can be civilized enough to not shoot people over donuts and coffee.