Even if you unfollow everyone who occasionally shares outrage posts, there are still a lot of interesting people to follow. That seems to work for me.
I see the outrage posts as a kind of meta-study on human nature. Like, "oh, that's what attracts people's attention these days, noted, next.." type thing.
I think you’re right, little dopamine hits from attention or feeling self righteous. But I doesn’t seem to work on everyone, and that’s the part of tech Twitter I follow.