Because cognitive biases are one of the hardest things to even acknowledge, let alone suppress. All the media out there has such a strong bubble effect, because people hate being challenged and love to stay in their comfy echo chambers. Remember labubu? Bao buns certainly do not.

There have been so many bot armies exposed over the years that one would think every narrative being pushed should be considered to be backed by bots. Some state-level actors even operate their narrative-pushing campaigns openly, yet people still happily deny their entire existence.

HN is very much not an exception to this rule. It's very hard to accept that maybe some thoughts you have were actually installed.