Godwin's Law

This is how I learned about Godwin's Law, an (unfortunately?) useful term in political discussions, especially online, when people bring up Nazis. XKCD by Randall Munroe is an extremely valuable webcomic for educating folks on things like this. I don't know if it counts if a person references a different person or group which held ideals and/or committed acts just as bad if not worse. 

Go to this actual webcomic, hover over the image, and there will be an additional message in the "title-text" . This one says: 

Constantly stopping these briefings half-way through is becoming a pain.