trumpism

Don't try to legitimize them.

what do you mean

giving them their own party makes them an actual legitimate group. They should just be ignored.

See post WW2 Nazi germany for example.

Imagine if they allowed the Nazis to continue to be a thing.

AfD is a new party. My point was after the war there was nary a nazi to be found. NO ONE admitted to it because the vast majority of people were either ashamed of themselves or shamed by others into obscurity.