Taste of cinema's list description: Blood, violence and depravity are themes that've shown up in our artwork for thousands of years. The thrill of watching gladiators torn apart in battle was once a popular form of recreation. Indeed, during the times of barbarism and cavemen, the law of the land was kill or be killed.
Mankind's bloodlust, it would seem, is old as mankind itself. Our methods for pandering to it may have changed, but our repressed, savage desires have not. There's no denying that the survival instincts of our ancestors remain with us to this day. So, how is one to satisfy their twisted cravings? What outlets exist? The answer: simulation.
Note: I couldn't fit their entire description here.