I suspect the Democrats' strategy, now that they know they can't pass their agenda in Congress and pay their creditors, is to make the country ungovernable. The things they're saying are intended to set the stage for massive civil unrest after they lose power. Biden is saying that if they don't get their "voting rights" bill passed, the next election won't be legitimate. He's on stage screaming about George Wallace and Bull Connor. You can see it with the redditors talking about how the US will be a fascist corporate state forever if the Dems get voted out.
If they lose the midterms and especially if Trump takes back the White House in 2024, they may be planning to go scorched earth and direct their golems to burn and destroy as much of the country they can. The goal would be to make the fascist takeover a self-fulfilling prophecy, with the Secret Service left with no choice but to open up with automatic weapons on an armed mob trying to storm the White House. Photos and videos of the event would be plastered across every news channel, possibly intended to pave the way for a coup by the likes of General Milley in order to "restore democracy."