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Honestly we don't need downvoting at all. Just upvoting to allow good stuff to rise, and flagging for hate speech and illegal stuff.

Can't disagree with this enough. Twitter exists, and it sucks. Every site that only allows upvoting becomes a segregated cesspool as different factions just cheerlead in their own tribal zones.

Twitter sucks for other reasons, not because they disallow downvoting.

Please, pray tell, how would you even determine if something was "for the wrong reason".

Slashdot had metamoderation, where you were asked whether various anonymized votes/tags were valid or not.

The same applied for "upvote"