Last year, when I was covering Fan Expo for BlogTO, I spotted a guy taking photos of a Ms. Marvel cosplayer behind her back (presumably getting some butt shots) and reported him to security. I didn’t get a good enough look at him, but I did my best in saying to someone to keep an eye out. I’m not sure what that did, but it was the best I could do without running up and punching the guy.
People need to break away from the Bystander Effect. It’s hard to know what’s the right thing to do in certain situations, but we’re a communal species. Civilization wasn’t built on gawking, but on ideas and actions. We need to remember that if we’re to make any kind of progress.