Pick an absolutist moral system, and if you're wrong about one thing, you're wrong about everything; the one wrong thing means the system fails.

Card is very tightly ensconced in a vast edifice of wrongness, and one strong structural crack will drop the great majority of his miserable life on him in a crushing mass. So there can not be any questions of right or wrong, only done and not done.

Card'd be happier for the event were it proved survivable, but doubtless thinks it not so now.