I think that realistically there is a part of kris that enjoys the terrible things, just like how many people have thoughts or feelings deep inside that they aren't comfortable with or wont act on. I dont think this means he WANTS this shit to happen but its like when you get the urge to do something and you decide to not do it because everything else you feel goes against that. Kris is a teenager going through all sorts of crazy stuff. theres gotta be a deep down liberating feeling to acting on his darkest thoughts, while the entire rest of his psyche knows thats fucking crazy and tries to walk back everything you do in snowgrave.
him being a little prankster doesn't mean he truly wants to murder fuck everyone.