In nature, the rodent has a chance to escape. In captivity, it's forced to be in closed box with the snake, having no change to survive. (Expect if the snake is not hungry, but that's not an argument. )
I've never really understood the argument of the rodent not having a chance to escape the snake. Does it have a chance of escaping when the rodent breeder gases it? Seems contradictory to me. (Not an attack against you, just thinking out loud.)