I understand your point, Neko.  I think that part of the problem consists in the fact that that not enough people flag offensive comments.  I think that if they did, many of the comments would, in fact disappear. 
I do not think that NCR is at all involved in the comments any more.  
Regarding the anti-Muslim invective -- I agree with you.  I think that much of the same happens with homophobic comments.  I don't really understand why there can't be some clear lines drawn regarding what's acceptable.  I think that, perhaps, people think that cutting out offensive speech somehow infringes on general freedom of speech.  But I think that's a mistaken perspective.