Killing people in this game is not griefing. It's not against the TOG ethos. It's the way the game is designed to be played and even as TOG members we are perfectly within our rights to kill any other person we come across in this game and take their gear.
What we are not allowed to do as TOG members is get insulting and abusive over chat, spawn camp them (hard to do as spawning is pretty random) and carry out other 'abusive' acts.
My philosophy in DayZ is simple. If you are not in TS or I can't identify you as a TOGger, you are an enemy and fair game.
For this reason I strongly urge all TOG players to put TOG tags in your profile name so that even if you aren't in TS, if I can ID you I will recognise you and wont shoot at you.
This is just my base philosophy. How I actually act at any given moment is really up to my whim at the time. As yet I have only killed bandits. I've also helped out randoms with gear donations, healing, guidance etc. But I still view everyone who I can't ID as a TOGger as an enemy. And now we can't visually ID bandits, so I'm gonna be a whole lot more edgy around unknowns.