1) Many things are political on some level. Consider encryption, the future of technology, automation, global trade. What counts as political?
2) Not discussing things that are deemed "political" is itself a political act - you're basically saying, "we don't need to talk about these things that are actively causing harm." Often times, this is a show of support for the status quo - it's the privileged who get to say what conversations can and cannot be had, and they rarely say, 'let us stop talking about this subject that deeply affects us'. They say that about things that don't matter to them, because they're worried about civility.
3) Some people are actually actively fighting for their very right to exist, politically and in the physical world. Consider the current administration's (especially the VP) stance toward LGBTQIA people, or toward abortion, or consider the active physical harm perpetrated on the bodies of non-white people by institutions and corporations. If you're upset because people are getting their feelings hurt, consider the people whose actual bodies are being hurt, whom you are now potentially silencing.
Sure, maybe hackernews should be a place where people post stuff like "Show HN: Version 1.2 of my parsing state machine" and nothing else. Maybe we yearn for the yester-days of freshmeat or whatever.
I don't operate under the assumption that HN is a free space or a space for me in particular or demand the right to say anything I want on its platform. I did appreciate its relative openness and the general quality of its commentariat. But this experiment has radically altered my opinion of HN as an online space. I'm going to re-evaluate that, I guess.
This really does feel like someone grumpily saying, "keep it down, kids, we're trying to eat dinner here!"