This was about the pure evil and the pure good found in fantasy and sometimes in SF. Particularly the older works.
Hmm. I noticed at the time but did not get a chance to say, being the audience, that fantasy started to take over from SF, and that may have been because the readers like that pure good and evil. The panelists -- all of whom were predominately SF -- were lamenting its purity, though one did argue with another than it only simplifies it, which may or may not be over-simplifying it. They wanted more moral grays.
Evil as a deliberate choice. (I put in, later, that willful ignorance can be a factor.) Much certainty no one ever chose to do evil
Whether this is all Christaintiy -- did the Norse gods, or Greek gods have anything like this? I was able to put in two cents there: depends on when in Greek history. Sure, in Homeric Greece, all sorts of amoral gods, and Telemachus takes on a shipmate who tells him he's a murderer. Then, in classical Greece, much more morals; in an actual trial, a man defending himself on charges of murder that he took a sea voyage and arrived safely. Which is why Plato thought the myths should be censored.