BOOMERS WENT BUST

Many beats and boomers started out rebelling against the McCarthyite late backlash against communists, as well as against the Cold War in general.
Many boomers' parents had been socialists or very left liberals and Soviet sympathizers, both before, during, and after WWII. The CPUSA itself was a both a tool and a front for Soviet incursions. 

(One can certainly expect any radical organizations in this country, right and left, to be heavily infiltrated by Russians ab initio. All can now see some of the Russian interferences here, the publicized ones, nowadays; in the 40s and earlier, although those interferences had been, if anything, even more intense, Americans often treated such claims with incredulity if not open hostility.)

Many boomers actually held the ideology and values of their leftist and pacifist parents after WWII, and for a long time have continued to hold them until today. 
They tended to disbelieve McCarthy, although the events that lay behind his campaign, and had preceded it by many years, were both real and catastrophic for America. 
Nothing McCarthy did had much effect on this already foregone communist penetration outcome.
Neither of these generations was fundamentally radicalized by Vietnam by itself.
On the contrary, boomers were more radicalized by their parents, by anti McCarthyism, and by the Cold War in general, than by Vietnam.
After all, Soviet Russia was written out of the James Bond films as the bad guy in the 60s, during the Cold War. 

More importantly, the boomers developed, positively, into what they became for reasons beside both anti McCartyism and anti Vietnamist pacifism. The wealth in America after WWII may have been the single most important factor. The shadow of the Cold War may have been the second.