As I understand it thwre's a German phrase which translates as an innoccuous sounding "I didn't know", which is illegal in Germany because of its association with Holocaust denial.
It's possible in the 1940s when media was tightly controlled, that there were people who didn't know. That is not the case today in an era of mass media and social media. They will always have known.
A lot of people may not survive Trump. If you survive, make sure they don't get away with saying "I didn't know".

