That'd make you quite hypocritical to comment on this issue then. Those baby mice could have potentially been someone's pets, like those kittens could have been. No different really.
I'm not saying not to feed your snake mice, I'm just saying it's ridiculous to be so outraged about feeding kittens to another meat eating animal when you're doing exactly the same thing in principle with the mice to another meat eating mammal.
Much like the person who sees a cow killed for food on TV, getting all "aww they killed the cow, that's an outrage" while tucking into a nice medium rare steak.
Don't get me wrong, what that guy did to the kittens was terrible and he should be punished, BUT you're doing something really similar.