Have you read this thread that is currently pinned to the top of the page [0]?
I'm a one-time conservative who moved to the center after Trump. I live in a deep red state but work remotely with an extremely left-wing company (the kind that regularly has deep discussions of identity politics during work hours). I like to think I have a pretty good idea of what each extreme looks like and every shade in between, and HN has by far the most balanced political discussions I've ever seen in any forum in-person or online.
Part of my evidence in favor of that claim is that people on each extreme both perceive HN to be biased in the opposite direction.