Roleplaying vs greifing?

[Alrin]

This isnt about LL guild rules(its not my guild so I dont care what rules you use). But this is about perspective on MMORP gaming and was inspired by the LL guild rules.

Mongo made this quote - "There can be legitimate role-playing reasons for playing this way[{KOS], but because KoS activity is just a hair's breadth away from griefing and harassment, one should not do this while under the banner of the Lurker Lounge."

2 questions.
1 Why does a roleplaying validate an activity otherwise considered wrong?

2 Is it even possible to grief someone on a PvP server?(Of course using exploits against someone is greifing, but we all agree exploits are wrong.)
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1) Your PC may have (by your design granted) a certain personality that which, upon certain met conditions turns into a murdering bastard. Turning away from what is normally considered "fair play". You don't abuse and slaughter every grey player you encounter because they have no chance. Fair play.
Your RP-ing can change that condition. It's the age-old Chaotic Evil(Dumb) problem. Player A creates a PC in a oh.. say a D&D game. Player chooses Chaotic Evil for alignment. Description of CE shows you are highly psychotic and can turn into a serial killer at any moment, etc etc. Thus, Player A embraces this and effectively turns into a jackass on two legs. Contradicting everything considered "common sense" and "fair play".
Again, you force a personality not necessarily your own onto your character(s). Some argue the flight from reality is healthy, some think it is downright dangerous to yourself. Argument ensues.

2) Griefing on pvp server? I guess it would be to use all means necessary to hunt players who have no chance against you. Grey conned people, that is. The grief-pvpers dont exactly go up against that red conned paladin that they spotted earlier, but will eagerly slash into the floppy skin of that grey weak almost-dead mage resting in the next clearing. But that's also point of perspective.
Fair pvping is fine (according to me), but when you go out and maliciously really only tries to harass and kill and waste other peoples time I would consider that griefing. Killing them, them camp their corpse and killing again would be scorned upon = griefing.

Atleast, that's my humble opinion.

-Al

edit: formatting