You never know what goes through peoples minds.
I heard on the news yesterday there was a gravestone in a cemetery that kept getting vandalized. The police set up a hidden camera and caught an almost 70 year old man doing it. Turns out the grave belonged to a childhood friend who had stolen $300 from a box in his room when they were teenagers. He was getting back at him for stealing it. You would think that him being alive and the friend being dead would satisfy him.