Well, that's a very provoking topic.
First of all, I'm against corrida in itself, since I don't like the cruelty no matter if it is against human or animals.
The problem is a bit different. Even in Spain, from where corrida originated it's 50-50. So around half of the country is pro and half of the country is against it, but you should take in consideration several facts. Some of them were already discussed, but I would dare to repeat some of them.
1. These bulls wouldn't even exist if not for corrida, since these types of bulls are specially breeded for the sole purpose of participating in corrida.
2. These bulls live a long and great life, compared to other bulls and cows who live for the sole purpose of beeing eaten.
3. When they get to the arena, they have the same chance to kill torreros and it happens quite often that torreros die. Well, it's a risky thing, so it's noit like these bulls can't defend themselves.
4. These bulls aren't just some pets like cats who can't defend themselves. They are breeded for fighting a nd killing for centuries.
5. Corrida industry actually gives quite some jobs in Spain and since they have an enormous unemplyment rate (around 25 % of the population), it isn't the time to provoke even biger problem for economy and society.
6. The meat that remains after the killed bulls goes to the shops for people to eat, so it serves another purpose.
P.S. No matter what, I'm against corrida, but the problem is more complicated than it looks from the first glance. We should first try to resolve other problems like cruelty towards other people, wars and staff like that, before we try to make lifes of animals better, since it just doesn't look right, when people think more about animals, than about their fellow spicies...
For example, if people say that the bull doesn't want tofight, but then when you have a consitutional to go to army forces, but you don't want. But it's not a choice, you still have to go. Isn't it the same?
So how come we can think about such problems, when we can't even resolve our own problems?