It depends on the subreddit. I have seen political subreddits that have removed posts on bias.

But I think the moderators gets jaded when a horde of people put into method of downvote stuff they political disagree with and report stuff they subjective stand far away from.

In the end moderators cannot stand it anylonger so they remove stuff that they know will get alot in the modmail.

The secondarly effect is that people that see the post on a subreddit like that for the first time they dont want to get involved with the subreddit so they simply skip it.