Two hours is longer than my attention span, but I felt it was worthwhile.

That's good to hear. I know some ways to intervene when people are being obnoxious in public, but I know there must be ways I don't know and I have no idea anyway if the ones I know are the most effective or the most likely to protect the people being hassled or if they're just better than doing nothing. Thirty-eight people didn't really watch Kitty Genovese die, but that doesn't mean we don't still need to look out for each other.