I think downvotes are ok as long as they show the real ammounts along the upvotes, besides there’s no karma here.
Also for those that say people could abuse downvotes to bury discussion, well guess what? People abuse upvotes too to increase their visibility, then we should disable upvotes so they can’t be abused either, right?

I think it’s ok if an instance decides to disable them (or both) if they don’t want or can’t deal with being downvoted, but trying to spread it to other instances is just trying to create a circlejerk.