One can’t make a reasonable argument that anything is “supposed” to be consumed by another creature. Eggs aren’t inherently meant to be eaten, yet many predators scavenge them and they happen to be a good food source.

The claim I often hear is that we shouldn’t drink milk because we didn’t evolve with it as a part of our diet, but that’s simply not how evolution works. At some point, every food source became a part of each animal’s diet and things went from there; it’s not as though all food sources were set in stone before Homo Sapiens came into existence.

No arguments from me on the zany claim that camel milk will cure stomach ailments, though.