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We actually have been through this a few times already - as Holocaust unrolled in the occupied Eastern Europe in early 40's, there were numerous witness reports about German atrocities, but they were widely ignored by the Western media precisely for the same excuses - no hard evidence, harms relations with Germany, wouldn't achieve anything etc.
Actually, we're repeating history over and over...
https://en.wikipedia.org/wiki/The_Mass_Extermination_of_Jews_in_German_Occupied_Poland