> There are multiple cases where someone commits an offense on orders from a superior member of his extended family; the attitude of the court seems to be that although he must obey the order he is still criminally liable for the act; there appears to be no assumption in the legal system that an individual always has the option of acting in a way that does not violate one rule or another.
When I read this, it was more interesting to me that American society is fairly committed to the fiction that such an option always exists.
I don't believe that the mere fact that a person took some action itself demonstrates that the person believed that action to be morally blameless. Of two paths, both can be wrong. Of many paths, all can be wrong -- or the conseqences of staying on the "right" one might be personally unbearable. I imagine that a mother who opted not to rescue her child from a burning building might be haunted by the thought that this was wrong, regardless of a generally positive message from society.
Also, I've tried really hard to read your comment in a way that allows for the existence of guilt. I can't see it. Do you believe people can feel guilt? Why would C. S. Lewis feel sorrow, in the privacy of his own mind, to discover that he is the kind of person who would do certain things?