To begin with, Thompson was a good writer but definitely not a political theorist or even a smart person, he was a clown who got famous by doing 'journalism" that wasn’t actually journalism all while out of his mind on drugs.
Second, the outlaw biker subculture has been studied extensively. They weren’t left-behinds retaliating against a changing world, they were saying FU to boring, middle class postwar society. If anything bikers played a major role in changing American culture in the 60s - possibly as much as the hippies did. Hells Angels had long hair and beards before hippies even existed, they experimented with drugs before hippies, they broke sexual mores before hippies. They were high testosterone party animals who liked living on the edge - which was anathema at that time. Some modern bikers might be left-behinds but not the ones Thompson wrote about. So the theory that Thompson predicted anything is total bullshit; there is no connection between modern politics and biker history. The author of the piece seems to have a personal connection to Thompson and gives him too much credit.
Finally, the idea of “total retaliation” is too scatterbrained. The reality is simple – mainstream Americans have been hearing how terrible we are from the democratic party for decades. We’ve been getting nothing but deadlock from republicans. That’s why Trump won.