HN only (lazily) filters content. It doesn't engage in ideological vetting, and doesn't need to either.

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.

HN's filtering is anything but lazy. Do you have showdead enabled in the settings? If not, enable it and refresh this comments page.

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?

When a post receive a number of flags and downvotes higher than some configured threshold, they're marked as "[dead]".

[flagged] [dead]. Just [dead] by itself means an auto filter.

What exactly do you think vetting means? Why do you think it's only allowed to happen up front?