There are online communities where this happens. Generally, there is some barrier to entry that is merit based and the communities promote cultures of acceptanc

There are online communities where this happens. Generally, there is some barrier to entry that is merit based and the communities promote cultures of acceptance rather than "correctedness." This usually means that size is somewhat small and that moderation is swift, effective but fair. Some examples of communities like this are everything2 and tagpro. Essentially, HN is particularly bad at this because a lot of comments on here sound like that programmer who thinks that they're right and so naive that they believe anything they disagree with to be lies. There is no proof that the people commenting have any merit and their reputation is not on the line with their comment. I'm not really sure that a large, easily accessible community with minimal moderation could ever have quality discussion. Those conditions produce commenters with little reason to be responsible with their words.