It's hard to respond without specific links. From my perspective, there are throngs of comments on both sides of this getting downvoted and flagged, mostly for good reason but not always.
FWIW, I think any "$large-group-bad" comment probably should be downvoted on HN. The world doesn't work that way, so any such comment is likely to be a pretty bad one (relative to what we're trying for here).
Even if literally no one agreed, I still feel deeply that never discussing this topic at all is not an option, and I think that could be derived from the first principle of the site (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...), although I admit that the exact proof escapes me.
Here is a pretty reasoned take making the case for why its not a genocide: https://macdonaldlaurier.ca/im-a-war-scholar-there-is-no-gen...
I think its extreme to call anyone who disagrees racist.
It's one of the last bastions of large-scale intellectual discussion that hasn't be overrun by bots, teenagers, or trolls. Digg was destroyed, then Slashdot, and now Reddit is mostly AI spam.
Hacker News is a place where when I see spam, it looks obviously of place. And then an hour later... it's gone.
Incidentally, I was talking about downvotes and flags from every side of the conflict, not just the side you're talking about. I don't see a lot of difference there either.