Like duke, I just think that it is a little onesided, and I personally cannot see much art in it, but the meat is not wasted, so its just the manner of dispatch that raises my eyebrow.
The matter of bullfighting reminds me of an old joke. A tourist is staying in a Spanish town for a while, and decides to eat at a charming little restaurant close to the bullring/arena.
He sits down, and examines the menu. Beef products seem to feature heavily, and when he makes an inquiry as to the cause of this, it is explained that the meat is from the former combatants of the ring.
All well and good, he thinks, not at all pertubed. He decides to order Cojones, which is explained to him as roughly the same thing as lambs fry, but obvious difference of species.
Cautiously at first, he tries the dish, and finds that he likes it. He dines there for the next week, ordering the same dish. On the seventh day, he orders the dish, and notices that the...dimensions are somewhat smaller.
He asks the waiter as to the cause of this change, and is informed "Well, Senor, sometime the bull wins."

Now that would be a fair and even contest
