It could be reminiscent of the struggle for survival .
In that case, violence would concentrate human curiosity because it is, together with sex, the factor that can most affect the multiplication of our genes.
Another hypothesis holds that the news about macabre events make us live moments of activation with a happy ending, since we are not the victims .
Entering the criminal atmosphere creates a tension that relaxes when we close the book or turn off the TV, and that produces a release of endorphins that makes us feel good.
