Why we crave horror movies

In this passage Stephen King talks about why we crave horror movies and I do agree with his point. In my opinion we the people are really exposed into violence a lot. Humans have a history being violent, enjoying scenes of excess violence and even participating in them. Public fights, executions, arena battles and more. Now a days the thing mentioned above are illegal. People have a fascination with violence, a fascination with death. Stephen King says metaphorically that there is an alligator pool somewhere in the confines of our mind, constantly threatening to break lose and bite some one. He said he believed in happiness, as long as we kept the gater's fed. To me all humans have another side but most keep it under control or like Steven King puts it "fed".