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.
I feel like the opposite. This 'curation' creates and harbours one sided conversations at best and what's the point? 1 sided conversations are not conversations, you are playing tennis with a wall. The wall will always win.