I mentioned that there is no difference between keeping a hamster (since I've previously owned two lovely gals) in cage, and a Ball python. They are both originally animals found in the wilderness that humans have kept as pets for ages. Also, the snakes aren't taken from the wild, they've been bred in captivity and are used to living safely in a cage.
I also referred to a research about chickens in captivity and chickens living freely, where the chickens kept in captivity produce way better eggs and get along better. As to where the chickens living freely were pecking each other to death, rivaling, producing bad eggs so on and so forth.. (this was all from a Norwegian study)
Nothing else really hit me at that time, so that was all I came up with.