Why does almost every pack want to kill my sims?

Many players enjoy an element of risk, and for every way that they implement a way to kill sims in game, they generally give a way to prevent/avoid it if you wish. I for one enjoy having a bit of danger for them, and the chance that I may have to think on my feet a bit and change up my story line. It helps a little bit to avoid boredom. Besides, this is a life simulation game, and death is part of life, as are accidents.