I am insisting on no such thing. I just told you not knowing is both fine and normal. I am saying the reason people don't know is because they dont care to know. Not because they were not presented with the option to learn this information.
Your wife may have been failed by her teachers though. Since she did seek out information about the nazis. When your wife took her class on the holocaust, did they not look at nazi uniforms (The SS or SD hats for instance), mention Theodor Eicke, the designer of Dachau and the inspiration for all subsequent concentration camps, executioner of Rohm and commander of the Totenkopf division a division of former concentration camp guards? Could she recognise the triangles of the concentration camps? The double sig rune? The nazi reichsadler/parteiadler?