You can call it de-sensitized to violence or whatever, but at what point did people think that this would a fun event to attend?
Forget the animal rights issues for a moment, because there is really little to no agreeing on that topic, and consider the actual implications about this.
Do people buy tickets?
Do they have concession stands?
Is there a minimum age requirement to attend?
Think about it. This isnt about whether or not its right or wrong to do this to the animal, nobody will agree about that, its about whether it is morally acceptable to attend/cheer at this event or what the moral implications are regarding profiting by holding this event.
For example:
Hockey Game vs Animal Slaughter Extravaganza?
You'll see me in the Dome every time even if the tickets are 100 times more expensive.
At what point does watching an animal be slaughtered get fun?
And I dont think anyone can blame this one on TV and video games.