Interesting connection, and I'll bet I don't want to know anything more about the situations you've seen. I'll bet it was terrible.
I'm not sure the connection with snakes holds, though. Humans are dietary generalists, and we have complex enough inner lives that we can rationalize basically anything. Plenty of snake species will hold out for their preferred food source in captivity until they die. Not sure if you've bred many snakes, but some hatchlings simply won't eat -- and this is not because they're unhealthy or malformed, they're just a species that doesn't find captive offerings to be close enough to what they recognize as edible.