I'd agree with that XKCD strip, as long as it's remembered that each community has the right to take a completely different stance.
I think it's understood that Youtube is legally allowed to silence gun videos, but of course other communities are legally allowed to complain about Youtube's decision. Just like said community might legally gray out your post complaining about their complaints.
So I really don't think pointing to that XKCD strip again really brings anything more than a touch of irony to the discussion.