lol- Explode on a survivor
I see what you mean Byte, and your fears could be very real if L4D ends up getting a community full of Halo 2 or CSS types. I'm not to keen on stats, especially the console-esque "Achievements" system. Combine that with a vote-kick system and its very possible to have assholes kicking people for not enough merits, much less too many demerits.
Also, why can't they just add a forgive system for TK's and other demerits? Of course a lot of assholes never forgive for anything, but I think it would be way better than "TK = insta-demerit = you lose"