"SJW", while neither an apt nor particularly nice monicker, does (to some) refer to a practicing particular brands of off-putting rhetoric that are uncompromising to a fault. I see people largely in agreement talk past each other because one person's mind is already made up in a way incompatible with someone else's experiences.
A HN commenter once suggested that agreement has become a form of social signaling. I don't know if I believe that, but it would be dangerous and counterproductive because arguments need iteration. If you can't make your case in a way that convinces people with your same goals, you're not going to convince people that don't yet share your goals.