It's the circle of life. Thats the same as someone who loves rats getting mad that us snake keepers feed them to snakes. Or little baby chickens. It's all the cycle of life. As long as its not going to waste and is used for food.
Not quite sure how you can be angered by that yet ok to feed your BP mice or rats......or feeding retics rabbits and guinea pigs.....
And i personally dont do it. Was more just a statement as i dont breed snakes but i do know people who do sell off normals as food for other animals.