Morbid Video Games

Has anyone ever wondered how someone could create such a morbid video game? Don't get me wrong, I love watching video games and playing them. But, a lot of them are filled with violence. One of my favorite games to watch is Heavy Rain. The plot is that there is a man who is called the origami killer who kidnaps kids and puts them in a sewer or well. He then sends the victim's parents a locker ticket and the locker has a box and multiple objects inside. And the essential question that he asks is, "How far would you go to save your child?" As the game progresses, the father is put to through trials that continuously risk his life. At one point, he even cuts off his own fingers and kills someone. Though the game has a good story line to me, I am somewhat appalled at the fact that someone can come up with a tragic story like this. How can one come up with the idea of hurting oneself over and over to save someone else's life. I'm just curious as to how their mind's work. It's a mystery.