It's my impression that alt-right support for Trump reflects, at least in part, a backlash against the anti-white, anti-male ideology of the liberal establishment–even though the liberal establishment is dominated by white male thinkers and powerbrokers. This has been brewing for a long time. Take the Bakke case from the 70s.
And I think there are some legitimate grievances. The white guilt, check your privilege tactic has no traction with me. Likewise, I'm not ashamed to have a Y chromosome.
I'm a critic of Muslim immigration, and I'm a critic of illegal immigration–largely due to the drain on social services. But those are the only immigrant groups that concern me–for different reasons.
The problem is a reactionary policy. Overreacting to something wrong is just another wrong in the opposite direction.
Take white nationalism. Bracketing the moral issues, there's this myth of white identity and solidarity. As if whites ipso facto have more in common with each other than they have with other ethnic groups. But that's silly on the face of it.
To begin with, you have many children of immigrants who become thoroughly acculturated into American society and the pop culture.
In addition, we've had different ethnic groups rubbing shoulders in America since the Colonial era. That's nothing new.
But there's also this myth of a white culture that caucasians naturally relate to. Yet that's a wild overgeneralization. How much to Mark Twain and Henry James have in common? How much do William Faulkner and F. Scott Fitzgerald have in common? How much do Johnny Cash and Nelson Rockefeller have in common? How much do Billy Graham and Willard van Orman Quine have in common? How much do Clint Eastwood and Susan Sontag have in common? Or J. Gresham Machen and Andy Warhol? Or Eudora Welty and Robert Mapplethorpe? And so on and so forth.
Likewise, there's a basic divide between highbrow culture buffs and lowbrow culture buffs. It's not as if the average white American has a taste for Quattrocento art, German Lieder, and the novels of Anthony Trollope.
To take a different example, when I attended high school, back in the 70s, David Bowie was a big rock star. And appearance wise, you can't get more Aryan than Bowie. Yet his gender-bender image was naturally repellent to any normal American boy in the 70s.
To take another example, it's my impression that traditionally, Italians didn't identify as Italian, but as Sicilian or Lombardian or Ferranese. In other words, identity was more regional than national. Likewise, I think that traditionally, a German wouldn't so much identify himself as German, but, say, Bavarian Catholic. By the same token, even though Austria and Germany have so much in common, many Austrians did not appreciate the Anschluss–even though they couldn't denounce it in public or do much about it.
To my knowledge, Mussolini was fairly popular until he made a pact with Hitler, resulting in Nazi troops stomping around Italy.
It's wholly artificial to posit a generic white culture that white folks in general relate to. That never existed. And it never will.