We share the blame as we spent 80 years relying on the crutch of US military support and now we struggle to see how we can stand up on our own without the crutch. The next decade will test the resolve of other liberal democracies to survive this challenge.
Republics fall, progress isn't linear. Even c. 2000 years ago people were writing about how democracy falls to tyranny. The world is a lot more global now, but the Roman Republic would also have seemed rather "global" too, yet was replaced by the Roman Empire not long after Cicero was writing.
[1] https://en.wikipedia.org/wiki/Social_cycle_theory