(Monolo Snachez the bullfighter refuses to kill bulls in "The Book Of Life")
Bull fighting is wrong. It's not a matter of culture because the torture and murder of innocent beings is not acceptable in anyway. Not for humans. Not for animals. Heck even the abuse of personal rights cannot ever be defended as a matter of culture, yet people still continue to oppress and disadvantage others using culture as an excuse.
Culture is never an excuse for abuse.