I agree with PinkLady, judithc and others about conditions in the U.S. under the current presidential administration.
I do not at all see a parallel between current (democratic) socialist movements in the U.S. and the extraordinary and outrageous events leading up to WWII. A large part of the discussion around "socialism" in the U.S. right now simply has to do with the implementation of the same kind of universal health care that many other democratic nations already have, including Canada, Germany, Australia, France, Switzerland, the U.K., etc.
I also think that Americans have already been normalizing extraordinary and outrageous events for a long time in the form of U.S. imperialism and involvement in other countries. Dangerous nationalist ideologies have long devalued the lives of non-Americans, immigrants and those in marginalized communities. A book like Resistance Women is important and useful for showing how political sentiments like these are built over time, and I believe that this is more or less the type of thing that Arvid is referring to.