Hacker news engages in ideological vetting against users. For example, try posting content encouraging violence.
A good amount of the commenters on this story probably would encourage violence, or at least agree with the sentiment on a different platform, yet here they are. I'm not even sure if they're real people or bots.
We are having a discussion right now that would not be allowed if there was vetting.
A bunch of my comments were mysteriously deadened and I have no idea why - they aren't flagged. This was among them. Maybe it was a retaliation for talking about HN's filtering?