Take twitter shadow banning people as its an easier example.
The rules of twitter are simple - someone tweets and it gets put at the top of a follower's feed. This is accepted as "the truth of twitter." When this truth is altered and all of a sudden some individual's tweets are NOT showing up in follower's feed people should be rightly pissed. No matter who the target is - because the accepted rules of the platform have been twisted to push an agenda. It is no different than propaganda and an insult to free expression.
> If you turn your head one way it's fair
Anyone can certainly justify anything if they are willing to turn their head with the breeze. I would point out the blatant mod and brigading bias in r/politics as an example of something you as a presumed liberal should be equally mad about. The content there is laughable and part of the reason why people even subscribe to the TD to get what little news is there.
Reddit has a problem - and its been written about before. Mods are dictators of their own communities and have complete control to push their own agendas within places that should be neutral. I don't see much of a future for the platform if this is not solved.