> The U.S. anti-vax group is quite vocal and quite large.
Yes, here [1] is an example of a pro-vax comment, made by a flaired user, removed from r/conservative. The user was probably not notified of the removal, and the comment appears to its author as if it was not removed. To me, that is very misleading. I consider such removals a form of misinformation; other users only see a version of the discussion that is wholly anti-vax. Also, since that comment received 400+ upvotes, you can imagine many of those voters might have left the same comment if they hadn't found that one to upvote.
When a moderator removes a highly upvoted comment, they're not just removing one author's point of view, they're removing the opinions of all the people who voted for it.