2. If you admit Wrong exists, you must also admit Good exists.
If his behavior was wrong, it leads you to believe that there must be a “right.”
C.S. Lewis writes:
Of course I could have given up my idea of justice by saying it was nothing but a private idea of my own. But if I did that, then my argument against God collapsed too- for the argument depended on saying that the world was really unjust, not simply that it did not happen to please my private fancies. Thus in the very act of trying to prove that God did not exist-in other words, that the whole of reality was senseless-I found I was forced to assume that one part of reality-namely my idea of justice-was full of sense. Consequently atheism turns out to be too simple. If the whole universe has no meaning, we should never have found out that it has no meaning: just as, if there were no light in the universe and therefore no creatures with eyes, we should never know it was dark. Dark would be without meaning.
As Greg Koukl wrote:
To say something is evil is to make a moral judgment, and moral judgments make no sense outside of the context of a moral standard. Evil as a value judgment marks a departure from that standard of morality. If there is no standard, there is no departure.