I have violent dreams when I'm stressed out. Not as violent as yours but they usually involve screaming at someone and then attaching them, either hitting them or pulling hair or something like that. They happen often when my anxiety is very high during the day and especially when I am trying desperately to hold myself together all day. I'm actually not disturbed by them as I feel better getting all my anger out in my dream (however I'm not murdering people, just beating people up or being verbally abusive).