From across the pond, it seemed that Nazism resulted in the expelling/extermination of foreign, undesirable influences and a stirring up of nativist fervor in order to validate those actions.
Also here across the pond, we've had major immigration by Eastern Bloc or Soviet refugees in the past century. They're a huge influence on our culture and ideology and the direction we've taken since the Civil War. And we see nativist fears and xenophobia in things like the McCarthy "Red Scare", but were they entirely unjustified when today we're screaming about Facebook and soviet interference in elections? ... And our voices are raised in chorus of "get these homeless off the streets, expand [mental] [women's] [right-to-die] health care, defund Churches [and mosques, synagogues and Wiccans?] will no-one rid us of these troublesome [cops, judges]?"
Surprise plot twist: the vicious military expansion that was nipped in the bud left more of a historical mark than the mass emigrations and migrant movements going on underneath the wars. The USA got Albert Einstein, rocket science, a regime change in Hollywood, new captains of industry and finance, and lifeboats full of philanthropists. We children of the Cold War wouldn't know one another at all if it weren't for the IETF, NSF, ARPA-DoD, and TLAs that you can't stand.
Eugenics may be a pseudoscience or a discredited ideology, but is it also entirely without merit, or unjustified? What does a nation do when she's deeply in debt, and more people are struggling for smaller pieces of the pie, and her reputation and huge tracts of land are an attractive destination for refugees and migrants? I guess some of her citizens log into free websites and give unpaid "Billion Keyboard Monkeys" labor to the guys who host the servers.