Of course he would save a Jew. My point was simply to illustrate that if a psak has good reason, its not proven wrong just because it had the ‘wrong’ result.
If R’ Chaim knew the yid was in danger, he’d save him. But if he could rewind time he wouldn’t take back the pask – because al pi halacha he was not in danger (he would just happen to have the knowledge that his life happened to be in danger).
The assumption made earlier was that since the Jews were killed in Europe, it must have been a mistake not to advise them to leave. We can debate who was told what and why, but there’s no assumption to be made based on their deaths.
see R’ Dessler’s essay on this matter