Your overall point is not very clear. But regarding your statement that "a degree of honesty about human nature in general is part of that culture, that's true of any culture, is it not?

In my post, I simply pointed out one way in which the Japanese can avoid the need to be brutally honest. Also, as I pointed out, that does not necessarily mean that such behavior is harmful. In fact, it can be quite beneficial. It's only when psychopaths or sociopaths abuse tatemae that it becomes dangerous and potentially harmful.