I have, but for me it's not a vengeance or ill willed thing. Pure curiosity. The reason I never killed anyone is because I don't want to hurt anyone. But I would love to experiment on the human body. Find out it's capabilities and limits. And obviously I am also intrigued by the implications of murder. What would happen if I kill someone? Do they die differently than someone who just dies? Can I see the exact moment of death? Can I see the sparkle leave their eyey? How would people feel about it, if I murdered someone? Would they be sad that they died? Would they be happy that I killed them? How many different ways are there to kill someone? How creative can I get? At what point does it become inhumane? Is there a soul? Are they going to haunt me? Naturally I have many more questions but these are some examples. I also sometimes just see someone and imagine violently murdering them. For absolutely no reason. He hasn't done anything, and I don't hate him. I just like to play with the idea. Funnily enough, if I do dislike someone I don't want to kill them. I want them to suffer without anyone noticing, so they go insane in their own little bubble. They don't deserve death. They don't deserve that I murder them. But I'm not going to murder anyone because in my opinion it is not my place to decide who gets to live or die. I would murder in self defense, to protect me or what's mine. The bible allows it that way.