Right-wing movements in the US of 2022 are the culmination of over 50 years of organized conservative political action in America, which began at least a full decade before the fall of the Soviet Union. The infrastructure that all these right-wing networks are built on comes from conservative think tanks of the 1970s, conservative legal networks that first pushed Robert Bork in the 1980s, and the media from Reagan era dismantling of the Fairness Doctrine which directly led to Rush Limbaugh and all his imitators and eventually to Hannity and Tucker. I've watched these massive conservative influence machines over the last 30 years first-hand and "Russia" is really just a footnote to everything that US right-wingers have been working to achieve for generations - basically ever since Goldwater lost.
The psychological factors are even older. Essentially just American exceptionalism (Lipset, 1996) and anti-intellectualism (Hofstadter, 1963) mixed with old-fashioned selfish greed and good old Reagan style, "Government is not the solution to our problem, government is the problem." And don't forget the racism embedded in US life since its inception.
I watched people that, as teenagers in the 1990s, use to say shite like "it's a free country, I can do what I want" transform from mildly "speak English, salute the flag" types to anti-government Tea Party participants, to hardcore anti-immigrant meme sharers to full-blown Trumpers all without the help of any Russian influence but simply a diet of the US right-wing infrastructure that I mentioned above.
In short, I think you are granting far too much power to outside influences when, in fact, the weak points are all internal. Of course, Russia tries to influence and destabilize other countries the same way China, the US and even smaller countries do. And certainly there are going to be some points where Russia wants to do anything to destabilize the west and that aligns with some of the bat-shit right-wing agenda like pizzagate or qanon but I think its massively lazy to assign too much influence on external factors when the vast majority of factors come from domestic right-wing activities. Tucker and Hannity are massive bellends but they aren't Russian assets with their strings pulled by Putin. The vast majority of what we see in America is not the result of Russian influence but simply the evolution of US right-wing movements over the last century. Russia didn't create the post-Civil War Jim Crow laws and Russia isn't behind the majority of the right-wing radicalization of the modern US far right. But sure, they do try to amplify some of it. I just wouldn't put external influence as a major cause.
@Mciahel Goodman and
@harms already provided some good answers as well.