Nazis don't always look like bad guys in funny helmets. The Nazis and other bigots in khaki slacks and bright polo shirts who marched in Charlottesville chanted racist and anti-Semitic slogans I'd rather not repeat on a Saturday — or at all. But it's discouraging to feel that you have to explain, more than 70 years after Nazi Germany was defeated, why Nazis are still the menace that embody evil.
The 20th century saw a lot of state-sanctioned mass murder: Stalin, Mao, Mengistu and Pol Pot, Armenia, Bosnia, Cambodia, Rwanda, Ethiopia's Red Terror, the Great Purge, the Cultural Revolution, and more. In America there were lynchings and the cruelty of official segregation, which followed the end of slavery, and the massacre of so many Native Americans.
To cite one or another doesn't excuse any. But Nazism was something extraordinary. The laws on race and citizenship they began to impose on taking power in 1933, which were encoded in the Nuremberg Laws of 1935, invoked blood, soil and the twisted science of eugenics to make anti-Semitism and Aryan supremacy the law. They used those wicked decrees to begin to engineer the murder of millions.
http://www.npr.org/2017/08/19/544641070/explaining-again-thenazis-true-evil