Dave Grohl

Stopped a performance mid-song when he saw someone being beaten up in the crowd. He yelled at the instigator and ordered him to be ejected from the venue immediately, stating he wouldn't tolerate violence against people who paid their hard-earned money to come see him play, and that people came there to dance and have a good time without fear of getting beaten up.

When I discovered punk rock, the only punk rockers I'd seen were on Quincy.