You and Prager operate on the assumption that there are "evil people" as if it's inherent. I don't think there are inherently evil; I think people make choices to do things that harm others and/or society. But you can't impute certain beliefs to people based on their beliefs on this particular matter, which Prager assumes he can do.
I understand Prager to be saying that
goodness can only be earned, that evil emanates
only from the human mind and that it must be named, confronted and fought.
These all demand choices. The only thing "inherent" in them is that God is good, which I personally believe He needs us to aspire to.
And of course "you" CAN "impute certain beliefs to people based on their beliefs on this..." or any other "particular matter".
They either have the courage to actuate their beliefs, which are fundamental, or they don't.