This isn't entirely new or unique to America, but the dynamic is essentially:
Party A improves the odds fascism is successfully implemented.
Party B implements it.
Reducing the conditions for fascism to take hold is strictly off the table for both A and B.
Fundamentally changing the system of Party A (or B for that matter) through voting alone would at least require a Party C.
But even so it is the internal party politics prior to and outside of elections that are keeping this fascism paradigm in place. And that's where people's frustrations tend to lie.