You seem to think that the civil discussion that occurs here would carry over to these hot button topics, but I assure you that the kind of people who enjoy dragging a discussion down into the mud and participating in “flame wars” as you said will be attracted here once they know there is a discussion about one of their favorite issues.
In short, the curation of HN is what makes it great. Relaxing it would ruin this place.
There are quite a lot of members here who will flag any reply to them as they don't agree or simply don't like what they are reading.
Power abuse is just a casualty of cleaner boards.