I guess on a similar note if some one said "all Nazis were evil" you could try and counter that with the story of Oskar Schindler
https://www.holocaustmatters.org/who-was-oskar-schindler/
And suggest some helped saved lives.
It would be rather controversial or contentious, however if that sparked a good discussion that would be a good thing.
@freemo A good point, thanks.
@zleap Im not sure I'd consider Oscar a Nazi per se. Tons of people were forced to be part of the party just so they seemed loyal enough as to not be an enemy. I wouldnt call that being a Nazi, that is more akin to being a Nazi spy.