I had this really weird dream where I had a 2 Euro coin between my middle- and indexfinger. I was on a large square, surrounded by houses that looked Roman. There were a lot of people standing on the square wich was pretty big (100 by 100 meters or something like that). And everyone of those people I sliced their throat, with my 2 Euro coin. It didn’t feel bad or awkward in any way.
If dream characters are getting really annoying or attacking me or other dream characters I would kill.Sometimes killing bad guys(or people I don’t like) in a dream is fun. Like playing a virtual reality videogame. But I wouldn’t hurt innocent people or animals. Mabey go to my old school and scare all the teachers and bullys 
I think I’ve never killed ‘people’ in my dreams. But there was one dream where I and many other people fought an army of demons and one of them could regenerate himself, I killed him 3 times before I knew how to get rid of him.
In the last LD I had, someone slit open someone else’s body with a knife… It was realistic, save for the fact that there were actually /too many/ organs. (There were about four “hearts.”)
It was weird, though my first reaction was my dream-stomach churning a bit… =|
I once tried to kill a guy in one of my LDs, but never suceeded. I don’t get it. He didn’t die from four headshots with a gun…
I had a dream in which I killed someone just for the sake of it. After that I just went around killing people arbitrarily because I could. No one knew about it in the dream but when I woke up I felt so bad and so guilty, I started apologising to my fictional victims.