I suspect it's likely to promote a certain viewpoint. Hacker News has a vested interest in not questioning a system that it benefits from.

For instance, anyone who might be critical of a US historical policy typically has "no business" here because politics cause ideological flame wars, or some other half baked reasoning.

While it is very encouraging at fostering dialogue on tech, once the dialogue goes against Hacker News's ultimate purpose, to make money, that's where you start to see weird accounts and strangely offensive comments questioning the act of questioning.