I think that people are naturally intrigued by violence and extreme events.
If you saw a homeless bum in a subway and he fell to the tracks as a train was coming, would you risk your life to help the stinky bum or watch like everyone else around you and think wow im going to get to see a person die today.
I know there are heros out there that would help but im willing to bet that most people would just watch in terror/excitement.
For alot of ordinary people you dont eften get to see a live person die infront of you.
Just like when I was younger there would be a tornado warning and it was coming towards our immediate area and my parents were scared to death and I remember I was frightened also but more than that I was EXCITED!.
So invigorating to know something beside our mechanical life style is actually happening around us.
I believe that people feed off this type of thing.
Violence Corruption Sex Antilaw etc.
Not that any of it is bad