Well technically they are not breaking any of our current terms of service, basically they do no harm to anyone, not many people read the comments much anyway.
Personally I don't see the harm or that it's demented, most porn on here is demented in one way or another, it's just another point of view, it's like I don't like some kinds of porn, but I wouldn't complain about it since some would hate my kind of porn.
Same with comments, I may not like some comments made on this site, but as long as they don't insult fellow visitors or the artist and keep to the terms of service, or unless they are spam I leave them be, since one should respect other people's opinions and comments.
I will consult with the site owner for his opinion as I'd like to hear it.