Facts and circumstances are crucial. Was the infidelity an isolated instance or a chronic pattern? Were the transgressions long ago or recent? What levels of deception and cover-up were involved? What was the position of authority the person held when the infidelity occurred? Was there an alarming degree of recklessness on display? What evidence is there that this person has changed his ways? Has this person shown other worrisome signs when it comes to character and trustworthiness?
Under this rubric Sanford strikes out on nearly every point.