All Men are capable of choosing to join with Good or with evil, for two reasons.
The first is that we are eternal Beings whose primordial existence preceded creation - so we know primordial chaos by experience.
Secondly, we are all children of God who each inherit something of that divinity which created our reality. So we know the reasons for creation, its purpose and meaning.
The choice between Good and evil is the choice between affirming and commiting-to the purpose and meaning of creation; or rejecting these (and the divine in us) which is implicitly to desire a return towards chaos.
This is a real choice, based upon experiential knowledge of the goals of evil and of Good.
And ultimately it is a binary choice.