Is it better overall to have a country in which most people are firmly convinced

Is it better overall to have a country in which most people are firmly convinced

War

Is it better overall to have a country in which most people are firmly convinced that engaging in warfare is never morally permissible, or to have a country in which people believe that engaging in warfare can sometimes be moral? The second alternative has considerable initial plausibility to my mind and certainly seems to be the more popular one by a wide margin, but I've found that the people whom I otherwise respect most for their intellectual abilities tend to believe the former. So I wonder.

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