I sure won't encourage it, ppl will do it anyway. Besides, you don't wanna apply some ethical conduct or honorable behaviour to a video game, especially an MMO, do ya? There's no such thing as 'honour', not here, not in real war. One of the first things they taught us in training to get rid of that overly idealistic concept.Btw, is your point "both sides do it so it is fine"?
If both sides agree on it - fine. It'll just never happen.
I let this lowbie shaman live, runnin around solo in RVR lake. 2 min later he's back with his buddies, jumpin on my dead body, and I can't even blame him.