I think it's more about the pseudonymity of internet culture and the interactions it tends to fosters. eg: I am responding to you without knowing you personally and the only relationship I have with you is your username and the broader HN message board; the freedom to be critical without human 1:1 feedback.

There is a lot of space in between Tiktok's current policy and allowing literally anything that's legal. It doesn't have to be a binary choice between chaos and strict policing.