I'm saying let Twitter do the work of blocking those users. Instead of hitting the "ban" button as they do now, they hit the "Nazi" button. Now they're Nazis and everyone who says "I don't want to see Nazis" won't see them. It's not any more work on the user's part.

And I haven't seen a reason that this is any more tedious work on Twitter's part than the work they do blocking it. Maybe one argument is that Nazis are more likely to post illegal stuff, so banning them early preempts the work of looking for reasons to ban them later.