It's a fact of life. Get over it! Just cos longnoses CAN eat rodents doesn't mean it's best for them. I, for one, recommend feeding herp eaters herps occasionally. An all rodent diet IS NOT the best diet for a lot of snake species in captivity.
Beat me to it Vanan. But honestly, you may keep them as pets, while some species live off of them. Similarly, many people keep MICE and RATS as pets, and the majority of snake owners feed those rodents to their snakes.