The only explanation for getting rid of dislike count that makes sense to me is to make big brands happy as their videos can't be made to look bad with a high dislike count and they can't be "dislike bombed" for things that may be unrelated to the content (eg the recent Activision-Blizzard scandals). Why? Because in every other way (and every way for the viewer), this makes Youtube worse. So it's a hell of a price to…
They were used to bully people and diminish voices. It was a completely toxic element of the system. No, it isn't dumb corporate videos (who were prone to just hiding it at the outset, making the trolls hulk smash and angrily declare that unfair) that they're defending, and that notion is pretty comically dumb.
This whole post and the noise around this issue is so absurd. YouTube isn't worse because a bunch of ignorant assholes can't bully gay and minority people, or ply their misogynistic or backwards ways. There are loads of easy ways to automate videos and basically spam YouTube, and the system hasn't overcome that yet. Visible downvotes would do nothing when these players are uploading literally millions of videos.