A growing number of ecologists have begun to recommend lifting the ban on the hunting of leopards, which are not an endangered species, Sand on the international trade of leopard's skin. Why, then, do I continue to support the protection of leopards ? For the same reason, that I oppose the hunting of people. Admittedly, there are tar too many human beings on this planet to qualify us for inclusion on the list of endangered species.' Still, I doubt the same ecologists endorsing the resumption of leopard hunting would use that fact to recommend the hunting of human beings.
Which one of the following, if true, would most weaken the author's argument ?