My wife and I quit the one we were at in big part because sick hamsters or geckos went into the freezer too often, even though policy says to do otherwise.
At the same time I always made sure the reptiles were taken care of properly, and get annoyed when people act like all petsmart employees...
Why would you kill animals that could live an otherwise content left turn only life? by all means if it couldn't eat and would starve or fail to thrive. Otherwise it would be the equivalent to euthanizing a puppy for dysplasia