I Imagined Smashing Her Skull and Smiling

Do you ever imagine killing people -- accidentally, perhaps, imagining the murder of some might-be-innocent bystander? Do you ever dream of hacking and smashing a person to death? Naked flesh bleeds, mourning the loss of limbs damaged or altogether separated. Do you ever feel justified, or do you feel guilty? Or do you feel quite calm and content as you're killing?