Since you probably lied about one thing or another several times over the last week, I don’t think God would look upon you too kindly if you chose the moment when you could save a life by lying, to tell the truth.
You make a good point when there is a degree of self-righteousness that is not deserved it would be hypocritical to claim to be moral in the face of evil. One must never hide behind a false “morality” to do evil. But it is likely that a person who would risk their family in such an environment is a righteous person. For that person, I endeavor to give them proper moral standards to lead them to do the right thing.
Example: Husband thinks wife has gotten fat. She asks “do these pants make my butt look big”. Husband hides behind the obstensible truth to say “Yes” because his agenda is to shame her into losing weight. He isn’t telling the truth but serving his own agenda.
On the surface, the true questions appears clear. but in reality she is really asking “will I look as good as I can today in these pants”. One has to look deeply into what is the real question being asked to give a truly honest answer. As her husband, he made a prior vow to love his wife for better or worse. It is not a loving act to not make the effort to discern the real question (not what it appears to be on its face) so he can give an answer that will serve his agenda.
When the Germans ask are their any Jews in the house, the question is not what they are really asking and it doesn’t take into consideration legitimacy to ask the question.
Real Question: “Are their Jews here with the unspoken addendum “so that I may kill them”?” Truthful answer: No with the unspoken addendum “because what you propose to do is outside your legitimate right and to confirm their presence forces me to violate a prior vow.”
Legitimacy: This is the most important portion to this issue. The person asking the question has to have a legimate right to a truthful answer. In this case, I hope legitimacy is not an issue.
But in every day life, we are placed in situations where we have to exercise our prudential judgment on their legitimacy. If I have information which I’ve made a commitment to keep it confidential, I’m obligated to protect that confidence unless the person asking the question has legitimacy to the information. If legitimate, then I’m morally obligated to give a truthful answer. If illegitimate, their question places me in illegitimate duress because they either have not right to the information or no right to ask the question. When under duress, I have a right (and in the case of a prior vow, an obligation) to take proportionate action to remove the duress.
The idea that silence is the answer is wrong if the questioner willlikely reach gain the information to which they have no right. It is an example of trying to hide behind “morality” to do something immoral. In the case of the Nazi’s, silence will be definitely inferred there are Jews in the house. In real life, the prudential test is more difficult.
For instance, if the odds are 10% the person will gain the information from silence and the matter is not grave, silence is the required act because of proportionate. If the odds are 90% and the consequences of giving the information is grave (violation of trust or other grave consequences), the duress is such that proportionality might allow overt deception.
The situations are remote when not being truthful is justified. I just want to raise the concept that prudential judgment with regard to legitimacy and duress can come into play.