It isn't a great choice for users to have to decide between debunking someone's Facebook thing in their post's comments and thereby boosting engagement and promoting it to all their friends, or just leaving it be unchallenged.
Or for Youtube, do you watch a youtube video of a demagogue to prepare arguments against them, knowing that Youtube will promote it more because you watched it?
We need some kind of way to interact with this stuff while getting the choice to not promote it as a result.
I don't believe that when an algorithm is used, the output is suddenly not a function of human nature or human design. That suddenly no human has any responsibility for it.