My guess would be so that nothing like this would ever happen again... So germany would bever again start a world war... So the Nazi regime would never again rise...

You say hopeless...... why out of curiosity?? And who exactly was continuing a hopeless miltary struggle..?

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler