That's certainly what the Democrats keep saying. As OP points out, though, they have an incredibly strong incentive to get you to vote for them, just as much as the Republicans do. They are not your friends, they are complicit in creating and maintaining the system that entrenches only two parties in power forever. It would behoove us to temper their apocalyptic rhetoric with a little bit of healthy skepticism.

I don't look forward to another four years of Trump and I am particularly nervous about what it will mean for geopolitics in general and the Ukraine war in particular, but based on my observations of the behavior of both parties I would be shocked if it's even 1/100 as catastrophic as internet rhetoric would lead you to believe. Watching both parties, I don't believe the Republicans have in mind anything approximating what the Democrats want you to believe, and I don't believe that the Democrats believe their own fearmongering.