Those threads wouldn't have passed the thousand comment mark if HN had anything close to a prevailing attitude on the matter. As with many contentious issues, people tend to believe HN is unilaterally biased against them, sometimes to the point of that bias being enforced by the moderators.
>Which, personally, annoyed me, because I believe that even the deplored should have a space for communication.
8Chan and its contingent of neo-nazis were free to communicate as they wished until the site started to become a cultural nexus for racially motivated mass shootings in the US. I don't think deplatforming them was unwarranted. They have the right to their views, but not the right to force any establishment to host those views, even when people start dying over them.
Also, there are still plenty of places on the internet for such people to congregate and communicate. They can start a private Discord server and post manifestos from the race war there if they want.
It's easy to second-guess or criticize such actions from the outside, but sometimes you just have to be pragmatic.