I will admit I am not very fond of cats, mostly because I am allergic to them. But if I owned any animal that I was not able to secure and it some how was killed, then I would not try to blame others and prevent them from owning an animal that was within the confines of their property. If the snake had come onto their property and killed the cat then yes it is the snake owners fault. As stated in another post if the cat had gone into the yard and been killed by a dog would the cat owner be complaining? If the cat runs out into the street and gets hit by a car does the cat owner then go and try to pass laws to prevent people from driving down his street?