I believe all humans beings have it in them to kill. Not just bugs and creatures, but other human beings.
Humans are unpredictable. The veneer of civility and peace is thin. We all have a dark side. A mean and selfish side.
That doesn't mean you are meant to be a serial killer! It just means that you could be if you wanted and chose to be. Well, maybe not even then, because you might get caught first,,...but yeah.