You cannot show from any published writing by Keyes that he called Bush evil. He may have said he did an evil thing - but to the extent that politics involves good and evil, such a statement would be neither unusual nor remarkable. He may have questioned his motives. But only perfect people have unquestionable motives.
If I am wrong, as I often am, show me where, in so many words, he called Bush evil.
If you can't (heck, even if you can) maybe we could discuss whether Keyes and the President are right to say that we are not fighting and ought not to fight a religious war.
"I sit in front of a decision like that and I say this is a decision where somebody sat down to figure out how much evil they could get away with".
Determining that "this is a decision where somebody sat down to figure out how much evil they could get away with" is clearly (or at a minimum, a very strong implication) that the person is evil. I imagine one could parse their way out of it if they were really motivated, but it sounds pretty definitive to me.
Did he not say this? Was he not talking about President Bush?
You just don't know when to quit, do you?
Using your OWN logic, I couldn't call a rapist a "rapist" just because he'd done ONE EVIL thing.