The duality of human nature is the hallmark of the human experience. We can switch from boundless love and great self-sacrifice to cold-blooded murder, even genocide, in a heartbeat. Just a few generations ago, the United States of America and many other countries were populated by men who were loving fathers and doting husbands and who made their fortunes by brutally enslaving other human beings. By all accounts, Adolf Hitler was a generous and gentle partner to Eva Braun even as he ordered the senseless slaughter of millions.
