To each his own. I have no interest in cock fighting, but I don’t care if others want to fight their chickens.
Some of the most vicious rooster fights I ever saw were in my Grandmas pens.
Your grandma’s roosters did not have razor blades attached to their feet by humans. When it comes to human and animal cruelty it’s not to each his own. There are laws for those crimes. Arrest them and prosecute them.