This makes sense to me since leaving a comment (even a negative one) would be a signal of engagement that would likely boost the likelihood of a given article being/remaining on the front page.
https://github.com/minimaxir/hacker-news-undocumented#flame-...
I'll happily forfeit my right to remain aloof and to give no signs of engagement if I get annoyed to the point where I'd prefer to go to war.