I read a scientific article once about how the human physiology is designed to cope with multiple shocks and frights, as we would have done in prehistoric times ( 99% of our history as a species) and if we don't get those shocks and frights, we seek them out, at funfairs, and through ghost stories, etc.
Looking at that "cosy murder" discussion, it really stands out that watching and enjoying murders is a major past time in our culture - there are literally hundreds and hundreds of them in TV, films and books!
Isn't it odd that so many of us enjoy them so much, when none of us would want anything like that to touch our real lives.
Is this somehow regulating our physiological design need for fears and shocks?