Why do some people think it is cruel to have a snake for a pet?

Snakes and reptiles are not domesticated, dogs are. Though they may have been born in captivity they are not tame like a dog is and likely never will be. Snakes also eat mice and rats which people think is cruel especially live. It doesn't matter how much you take care of it, in a non-snake lovers eyes its cruel to own snakes as they eat mice and other animals.