Oh but I do. Some, like some Christians, are human beings in name only. Hitler, Stalin, Mao, Dahmer, Ghein, Malvo, Bin Laden, Hasan, McVeigh, etc. are prime examples.
Al bet, some extremely poor examples of human beings, still human beings. But we don't condemn the men on that list for eating pork, and shooting geese. We consign them to the outer darkness for the damage they do to other human beings as human beings.
There is a vast difference in structure and application of values. One does not deny the fact of identity, another denies it from others against the truth of the claim.
Listen...I would say that list is full of evil men, but they are men just the same. We don't obscure truth because it is inconvenient that human beings breed Hitlers as well as Washington's. If you deny facts you end up with an ethics indistinguishable from amorality, which is just as good as any other amorality.