Mainstream world news has a place on HN if it contains "significant new information", and as much as this site is primarily for curious conversation and gratifying intellectual curiosity, we don't want to pretend that horrific events like this aren't happening.
Horrific events happen almost every hour of every day. This is political, and the events that are upvoted are always from the same political perspective. If you don't see this, you're blind. But from my perspective, mods do see it, are ok with it, and that is unfortunate. There are few places left online without explicit political bias. HN used to be one of them.