First thank you for this response, and not an attack. This is what I was looking for, reasons. I was about to say no I really have not ever, but I do remember as Ghuljun after being full looted I killed the person and said to destroy everything, which was very out of character for me as I rarely took anything from my kills. I think there is even a log of me saying it. However Im not even sure I actually went through with it I just remember the log of me saying it and the fallout after. I guess it comes down to the situation, at times it is justified.
The issue I really have comes down to players who simply do this as policy, I remember running around with Nellaf and just thinking what an utter jerk he was as he fulled every single kill he made, and he made sure to kill his entire pk range every login. Just sucks the fun out the game for me at least.