Our attraction to violence is natural. We have always been a race who had to reach the top to survive. We needed intuition and intelligence to reach the top of the animal kingdom.
We are now at a point where violence is not the only answer and thats great but it will take centuries of peace before we get rid of the desire to triumph over others. Ultimately thats what helped us survive.
It is so natural that since as far as can be remembered humans are not only drawn to violence, we use it as a source of entertainment.