This point is discussed in Weingartner's book.
Prisoners have always been killed in war and it becomes morally very difficult to judge or condemn by peacetime standards. This is not to say whether such murders are 'wrong' or 'right', just inevitable under certain war conditions.

But 'Malmedy' has become synonymous with 'Nazi SS Massacre' because it has become a 'vehicle' for various political and revisionist arguments.

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson