No, I love PKing. I always play stealthy classes or those with lots of escape abilities and I never go all out on damage while ignoring survivability even while doing PvE. I also carry PvP gear with me. So when someone does attack me or my group, I escape, go stealth, stalk them and kill them when the right opportunity presents itself. Like when they are trying to gank someone else or are separated from their group or in the open with low health.
I normally don't attack others minding their business but it's so much fun repeatedly killing the ones searching for easy pray and especially satisfying if I manage to kill their entire group one by one, then camp them while they're vulnerable. It's an art, taunting them to chase me only to turn around and kill them when they pull aggro or making them angry so they do stupid things while chipping away their health.. it's what makes MMO's worth playing for me