Personally I dont think it would matter if they considered the war useless or not when a father loses a son in combat I think there will always be that question and possibly a feeling of guilt.
'The clock of life is wound but once, and no man has the power to tell just when the hands will stop, at late or early hour. Now is the only time you own. Live, love, toil with a will. Place no faith in time. For the clock may soon be still.'