Igor...if you have such a moral problem with having a snake, then why do you have one? You personally feel that it's wrong and yet you still do it? I'd say that makes you far worse than the rest of us who you seem to be trying to guilt trip over having pet snakes. OH yes, I said pet. While they are not domesticated in a sense, they are used to humans...they depends on us for food, housing, and medical care...that makes them a pet.
So far as your whole mouse murder is wrong vendetta...so from what I can understand, it's ok for the mouse to be killed and eaten by the snake, but it's not ok for us to bring the mouse to the snake. I sure hope you're a vegan or that'd be a big fat load of hypocracy right there. What do you suggest we do? Tie our snakes to little strings and let them hunt their own food in a field somewhere? Let them starve?
If you have such a problem with both keeping snakes and feeding them their prey, then I am really at a loss as to why you are a reptile owner in the first place.