Trump read the Wikipedia page on "stochastic terrorism" (which has rated a few mentions on here over the years) and thought "Cool idea, I'm gonna do that".
However there are solid reasons it's not possible for Trump to emerge as an interwar-style fascist leader.
First, social unrest is far less than in, say, Germany or Italy in the 30s, when irregulars of communist and fascist polarities were attacking each other in the streets in the major cities and economies were in utter crisis.
Second, Trump is not in dialogue with a bloc of the owners of national industries who could be persuaded to form a dirigist, collaborationist regime with its social base in the fantasies of exclusion he chooses to feed. Nation states (with a few exceptions probably) no longer have that capacity to broker enclosed labour and entrenched position to capital across the sectors. Too much of the production on which national economies depend is going on outside national administrative control.
Trump seems to have the attention of a minority of capitalists based on his last term, Biden is similar I think. Only those that imagine an unruly upheaval of laws and institutions that offers them improved profit will throw in decisively with Trump, but that's a different kind of gamble than Hitler and Mussolini were putting forward, as it relies on instability rather than a determinate reorganisation of power in their favour. Most will prefer business as usual.
That said, I think it's pretty likely that Trump's run will accelerate US imperial decline and looting. The well-laid plans of Trump's new cadre about gutting the federal bureaucracy are a case in point. Some of his backers have made a list of Trump-friendly officials and candidate officials they are intent on installing, which would probably be partly successful but also met with the agency pushback that handicapped Trump's first Cabinet in 2016. And I don't know this part, but I assume there's a long wishlist of regulatory functions to be ruined, which is pretty standard for "neoliberalism".
You're right though, whether Trump wins or not, concern about an eruption similar to January 6 but involving greater violence isn't silly. He's not discouraging it any less and the conditions to produce it don't seem much reduced.
My guess is Biden will receive a powerful boost from elite supporters through the second half of the year.
