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There are a number of dead posts in this thread. I'd post some here (some of which don't appear to violate any HN guidelines, I'll note), but probably those same moderators would kill this one, too.
The vast majority of comments on political/social topics fit your description. If you're thinking of the one I'm thinking of (not mine, if it matters), I can't think of any reasonable test that would conclude "this should be dead, but all those others can stay."
Edit: it's bigbacaloa's
Here is dang’s explanation: >>37421874
It sounds a fair banning for me.