Obviously when people with know-how want to discuss what they know-how about, that's on topic on HN. But you're underestimating the quantity of plain old internet slag, which is what repetitive flamewars (especially on classic flamewar topics) quickly turn into. "You are a pedo sympathiser and apologist" and similar dreck repels the users who actually know things and who make HN a worthwhile place, so your argument ends in a contradiction.

If you'd like to offer advice about HN moderation, breaking the site guidelines while doing so is unlikely to persuade.