Sure, if you find a comment section spammed by new accounts with thin histories that look synthetic, call that out. I'm not even trying to persuade you that it doesn't happen (though to me it would feel like a misallocation of resources to do it to HN if you were going to do it). Maybe I'm bad at detecting it as you say.
As for examples, I've mixed up message boards a bit as well as glyphosate/Monsanto, but here's me from 2017 implicitly arguing that controversy over Monsanto suing farmers is a bit overblown (no pun intended): https://news.ycombinator.com/item?id=14794627
From around the same time here's me saying that Monsanto's editing of a paper related to roundup safety was dumb but didn't concern me as far as glyphosate safety: https://news.ycombinator.com/item?id=14974180
In that second link in the wider comments Dang replied to a flagged comment: 'Someone holding a different view than you do is not evidence of bad faith, and the internet trope of you-must-be-a-shill is poison'. I agree with him and it's part of why I enjoy the HN community where this isn't the typical mode of reply.