Those who fought against and lived under Nazism are gradually passing away. The living memory is dying as well as a result and the first hand experience isn't getting passed on. After all, the growing supporter of the right (not necessarily far right) are actually aged 18-34, despite the stereotype that youths are more liberal. The housing crisis exacerbates the social tension because young people feel competition with migrants. And migration crisis will also worsen because of climate change. Worsening drought and decreasing water levels make agriculture unsustainable, which catalyses social upheaval and migration. Many historical settlements in the past have either collapsed or abandoned because of changes in local climate.
It's not really because it's their last chance, but because it is their best chance in the foreseeable future. One of their key allies, Russia, is close to falling under the weight of the economic consequences of its war, they are about to get complete reigns again in the US, in no small part to voter manipulation, and all they need is to stuff government a bit more to make it as much of a "democracy" as Russia's.
Not that I'm arguing against it being "their last chance", a lot of democracies are slowly wising up in their slow bureaucratic timescale about what's actually happening, how social networks are getting exploited, how just having one case against Cambridge Analytica did not so much stop the problem as acted as international advertising for its services, and how any advantages they thought they were getting are being undermined by those same networks propping up fascist on a global scale locally.
The US turning fascist is basically a whole globalist oligarchy turning on itself, and they know that they can no longer follow status quo or they will be toppled from down under by the those on top. The new populist fascist drive powered by the ultrarich wants to make the world eat itself before it eats them as we get closer to the consequences of global warming, resource scarcity, and population growth reaching its limits, not directly as a conspiracy but as a consequence of that's how they have always acted but now on a macro-scale.
the ultrarich wants to make the world eat itself before it eats them as we get closer to the consequences of global warming
Which is why some of them are building bunkers and hiring experts to make them self-sustaining. They somehow think they can weather the coming storm safe in their shells, the way they live their lives completely sheltered from the consequences of their actions.