Did you really see "fuck cars" and expect it to be polite to car people? One time, I told a car guy that I enjoyed taking public transit, and he aggressively told me that I "could pry his car keys out of his cold dead hands." I hadn't even said anything about him or anybody else. I didn't even know he was a car person. Car people are not going to cooperate and "work sensibly towards a better world." They don't give a shit about the world, and they don't give a shit about you. And this is a place where we can shit on those evil people.

I'm sure there are plenty of communities where you can waste time working sensibly with people who don't give a shit and will never change, and your message will surely resonate beautifully there. But here, we're in the "fuck cars" community, so don't try to tell me not to act that way in a place that is made for me to act that way.