I've been through a lot of web communities. HN is easily the most intellectual, respectful, and diverse. The simple reason is that we like to be here! In the same way that it takes a village to raise a child, your understanding of the world around you is drastically deepened by various points of view. I don't expect to find a better village anytime soon.
I remember when I first joined that I really liked how people who disagree here do not downvote but rather challenge you through a comment. It was a nice change from reddit... But times have changed and people love to downvote here these days.
Obviously that creates its own problems but at least you have to have a little bit invested in the community before you can start trying to dictate the conversation.