One passage that jumped out at me in the Rick Perlstein article I linked to the other day was this:
I collected volumes from a decade gone mad: texts by Black Panthers decrying “AmeriKKKa“; by New Leftists proclaiming that “the future of our struggle is the future of crime in the streets“; and by right-wingers like preacher David Noebel, who exposed the “Communist subversion of music” by which Russian spymasters deployed Pavlov’s techniques to rot the minds of America’s youth via their bought-and-paid-for agents, the Beatles. People who thought like Black Panthers and New Leftists, of course, proved a historical flash in the pan. People like Noebel, however, have proved a constant in American history. [Emphasis mine.]
Of course, Conservatives would insist that New Leftists and Black Panthers remain an imminent threat, but let us pass over such objections.
I suspect that the reason that “right-wingers” like Noebel prove more enduring is that Nationalist movements are rooted in “blood and soil” philosophy, and thus much less subject to change with the political fads. Cosmopolitanism, on the other hand, is much more intellectual and consequently much more susceptible to calculated changes in strategy, tactics and even overall philosophic disposition.