Well the fact that there is already plenty of animal cruelty does not seem like a good argument to further encourage more animal cruelty in my humble view. Traditions are often cruel, but, you see, the uses of humanity change with time: witches were burnt, people crucified and newborns given to the wolves, not to mention the Aztecs killing humans for the gods. There is no need to continue things that one thinks wrong.
I agree paxmao: the uses of humanity change over time. Here in Spain a new law has just been approved, called "Animal welfare law". With absurd clauses like a mandatory course for everyone who wants to have a dog, mandatory insurance, or the use of animals totally forbidden in circus, it seems that the prohibition of bets linked to animal fighting is the most reasonable novelty.
And yet bullfighting is the exception and it's still allowed
