QUOTE (hermit @ Jul 26 2008, 07:12 PM)

No. They're every opnce in a while acting how their characters would LOGICALLY react, according to the character's personality, and not according to "it's a PC, don't hurt it no matter how offensive it is" metagaming.
*deep sigh*
Ever heard the term "social contract"?
I don't give a rat's ass on what a character would "logically" do if it is detrimental to the fun had by the group.
Metagaming is a valid play stile for a lot of groups, i'ver fared well with a moderate amount of it for almost two decades of roleplaying and know many other groups who have made the same experiences.
This might very well be different for you- if your enjoyment of RPGs is based
mainly around simulating a fictional world, this aspect of the game being prioritized
over any other aspect because "unfitting" portrayal of a PC would ruin your immersion into the game world, then metagaming is clearly and always inapropriate and PCvsPC-because-they-HAVE-to-act-like-this might be the way to go (even though determining beforehand wether the PCs are compatible with each other might still be the better choice).
If
the whole group manages to agree that PCs killing other PCs for the sake of "character integrity" or whatever
and that a group should consist of characters who are likely to kill each other, go for it.
But PvP is a heavily emotional issue and wether it is tolerated should either be determined before start of play or the GM should call a timeout if such a situation arises and let the group sort out their opinion on the matter before play is resumed.
If everybody is fine with a certain level of PvP, great.
If not, killing of each others' characters simply equals being a complete jackass.