I feel it's worth repeating...
We know serial killers will often yearn to relive their dastardly and evil behaviors by saving trinkets and mementos of their horrible deeds. They are hungry to hate and hurt, it's part of their dark souls. When they can't get enough, they seek out events from the past in a warped attempt to satisfy their appetite for hate, and there are no limits.
I wouldn't want to be a DUmpass on judgement day.