Freedom of speech is not the same as freedom from consequences for your speech. Your definition of “reasonable” doesn’t sound like it’s reasonable by the consensus of users on Reddit. It seems like you’ve been fairly gun shy about posting what these “legitimate opinions” are. On Reddit, I would get in arguments with liberals a lot, because I consider them entirely too right leaning. But it never resulted in mod action or even downvoting, it was a discussion. There is one kind of opinion that pretty consistently resulted in downvoting, and especially mod action. And those kinds of opinions should be downvoted. The only things I can think of otherwise are people criticizing mods or Reddit itself and getting banned by power hungry admins, but as others have said, go to a different community if you see that.