We have, then, a conflict between people with different views of what is needed to advance the good, neither of whom is in a position to convince the other of his point of view. The dispute is a conflict of visions, based partially on a conflict in knowledge. Each man acts reasonably given the information he has, relying most on those whom he trusts. Each is thus acting out of good intentions, yet one must have unwittingly become a tool of evil. Without further information, such conflicts can’t be resolved, and so one of them must be horribly mistaken. In such scenarios lie great moral tragedies.
To be a great tragedy, however, each side must be acting out of good will, but one unwittingly aids evil.