It's disingenuous to blame it on the users when there are clearly other "forces" at play here.
There are a billion forums with less stringent moderation. Moderation is a very large part that makes HN good and not so game-able like most sites
What people maybe don't realize is how many constraints there are on HN's system. There aren't many degrees of freedom for us to change things that wouldn't lead to a massively different site, and most of those outcomes would be worse, because most of them would be closer to internet default.
It's easy imagine "HN, but without the things that I personally find annoying". But try to generalize that for a moment and the problem quickly becomes intractable.