Strawman. Leftists don’t claim Biden single-handedly ushered in fascism. Leftists underline how little Biden did to ensure a winning campaign, as well as how little he did to defend against Trump.
Biden enabled Trump by not stacking courts, not prosecuting trump hard enough, or choosing policy positions based on what would beat trump.
That playbook is literally how the US justice system has worked since pretty much the beginning. Our constitution explicitly enshrines the right to keep slaves.
And calling the Gulag Archipeligo a “first hand account” is laughable. That book is basically folklore and rumors.