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If it's banned in your country and people are still doing it secretly, why can't the government get to them and make them serve the punishment that is supposed to be given to them so that others can learn? This activity is not even to watch livestocks kill themselves in battle all for the sake of betting and making money, that's bad.
There's lots of things that are banned but still going and government can't do anything about that. So, it's not that surprising. But cockfighting is disgusting by itself and people engaged in it are usually not that great either. We inherited from the past like many other horrid things and we should get rid of it as soon as possible.