I'm too cynical to even manage disappointment, sorry. HN is... well, it's very white. I'm not so much talking about the people who comment here, but for the most part we're discussing companies founded and run by white people, funded by all-white venture capital organisations, with a largely-white employee base. Given that, it's sadly not surprising that many commenters here have really fucked up views on racism because there's no reason why they wouldn't. It's not like there's even any way to tell 99% of the time because the subject hardly ever comes up.
To me it is a faith-induced form of ignorance - that because you have mastered one of the tiny, tiny subsets of all the world's technical knowledge, you believe yourself to have similar ability in other realms of knowledge as well. Morality and ability become one and the same, especially after the conditioning of hundreds or thousands of pissing matches in which you attempt to prove the same point, over and over: "I'm right and you're wrong." Logic becomes one's drug, because it lets you win and be powerful. Other flaws don't matter because you can avoid those discussions(if you're a white, straight cis male).
But really, it's relatively easy to find people who know a lot of things and can work through deep logic. "Big-picture" judgment and perspective is a lot harder to come by.