It's a very good point, but how would it work with the rating system? Would deleting a so, so comment also delete a so, so rating? I still favour the fact that the organizers here can just delete offensive stuff anyway and it's just as embarrassing to the offender. I've had a couple of offensive ones, but I just tear them apart or defend myself and leave them where they are looking silly, forever.

I have also been attacked by 'malicious down-rating' too.... on pictures that were getting 50% favourites, which made it even more obvious something was wrong. The organizers kindly sorted that out, so the system works.