They use excuses like this:

The flagged comments given as examples are exactly the type I don't want to see here. Not because they are wrong (they are not), but because they are boring, low-calorie declarations of obvious that add very little value to the topic at hand.

They see rhemselves as people who should only have to read what they deem as intellectual conversations.

And that stems from the HN rules.

It’s all designed to shut down progressives.