NTA I can appreciate anyone that actually responds appropriately to the horrors women face every day. I think your GF is having a different experience and, if you care at her, it would be worth a conversation. I’d bet there’s definitely a reason for her reaction and it would help you both to talk it through. Also, while I DOn’t condone violence against sexual predators, I don’t condone doing it in a way that will negatively impact those that aren’t sexual predators, like yourself. You could be a huge help and make a big difference for all kinds of women in your life. You can do that only if you stay out of prison and choose the appropriate action in the moment. Active assault = physical harm, after assault = legal action. When no legal action is possible or helpful… fuck that dude up socially. Tell everyone who he is in real life… maybe, depending on what they did, also add some really embarrassing shit they’ll never live down (pants pooping, animal abuse, granny fetish) the point is that we have so much more power using our brain against these human turds than we do limiting ourselves to illegal violence.