I realize that this thread was dead and probably no one will appreciate its re-animation, but my personal opinion is that 'snuff', along with the killer triumvirate 'romantic-consensual-light' is usually used on this site as a short-hand for "This story is badly written -- pass it by". The only general exception to that rule is anything written by Kallie Thomas (although a couple of Faibhar's aren't too tough to stomach -- and I still haven't forgiven Kallie for killing that dog!).
Most of the snuff stories seem to be simple brutality, devoid of erotic content and designed to nauseate rather than to arouse. I realize that this is my own personal predjudice showing, but I always have to wonder about the misogynistic tendencies of the authors of these stories.
No, I don't think any of these stories should be banned. If you're going to start banning (which, obviously, you are not), I'd vote to start with the 'pedo' and 'scat' coded stories but, fortunately, we seem to be mature enough to say, "Your kink is not my kink, but I support your right to be kinky."
I notice that this site does not attract many of the "safe, sane and consensual" snuff stories that abound on other sites, and I wonder why that is? (The human meat-packing plant stories on this site would probably qualify.)