Time will tell once the electorate goes in to vote in our next president. ;0]
The reason the radical right is acting like that is the validated fear of socialist political rule from the left.
1. How is this a validated fear? Can you link to some validated source?
2. The Left? Which left -- the Greens? Yeah, they're a scary bunch.
Who are these leftists?
3.Socialist political rule? Like FDR? Like Scandinavia?
What do you imagine "Socialist political rule" would entail, Twilight?
The Democrat's aren't Left. They don't even represent the working class anymore -- which is one reason this class feels abandoned and is embracing the authoritarian Right, which is pandering to them with it's depiction of government as the enemy.
The Republican's have weaponized "Socialist." They've made it a scary word, conjuring up vague images of a repressive, Soviet-style, totalitarian state.
Today's Democratic mainstream is, in many ways, politically Right of both the Nixon and Reagan administrations. The platform of the actual mainstream Left, such as Sanders' "Democratic Socialists," pretty much exactly matches what surveys have found to be the views of the majority of Americans.