Happiness. Why you may ask? Well its simple... What do you need or want to be happy. This could lead to desire or love, which could both lead you into some bad stuff.. If you are deprived of happiness you'll be angry or sad. Sadness leads to depression. Anger leads to hatred. Also have you ever had that feeling something bad will happen after so many good things? That's fear, and it can destroy you. Also what makes you happy? It could be lots of things, including gaming, long walks on the beach, or even stabbing a dozen puppies in front of homeless orphans. My point is, happiness is a stone cold killer.