Removing forum posts can be (and was often) used to change the story, hide the context of a discussion and portray a member that a Mod or Admin doesn't like in bad light.
Removing swastikas or porn is one thing, but removing members' opinions (even their unfavorable opinions about other members) doesn't serve us well, I think. Regardless of whether it's Discord or Forum. Mute, close threads - yes. Remove (invisible) posts - no.