We must forgive him too. Because Christianity demands it.
Also Casanova. He impregnated his daughter, but he also must be forgiven his sins.
Nero, of course.
In fact, let's face it, we might as well grab a murderer from jail and make them president, because we can forgive everything that went before.
This is by no means a sign that we have only a convenient, shifting morality, and will support the devil himself if he wears a Republican red tie.