You should add a caveat: unless the players all agree to allow that kind of behavior.lukelightning said:But stealing/harming other PCs takes betrays that system and takes advantage of it, to the detriment of the game."
I don't like stealing from other players, but that's probably because I never play thieves. I don't mind getting stolen from, depending on the nature of the campaign.
But in the Dragonstar campaing that's just finishing up, the party plays a little game called 'Let's aim our loaded weapons at each other' roughly twice a session. No ones pulled the trigger, yet... I have high hopes for the final session (but that's probably because I play a cowboy-sorceror with Haste, Fireball, and no less than two high-energy weapons on his person at all times).
For some reason, we all find it enormously entertaining.