try my best to have as much good kill as evil kills. In my mind, I am doing the nexus-balancing act without being nexus. With couple of my neurtal assasin, I did not even think of PKing till my emotions are evoked, then I gank them down (5 to 1).
As a neutral, I have my own reasoning (listed in my role) why I am killing certain folks (PC & NPCs).
You can go on that killing spree, but you will get few IMM comments like "Neutral Assassin #007007007 just killing people because it moves". For me it does not make an interesting char if I kill everything that moves.