What you speak of never existed because they never called themselves democracies!
HOW MANY TIMES HAVE 3 EMPIRES HAD HAVE TO COOPERATE TO BRING DOWN 1 NATION!?
Nationalsocialism is until today unmatched. It is the weltanschauung that we desperately need to save our Nations.
It is not brittle or unstable. Capitalism is what prone to monopoly. The legacy of Nationalsocialism was buried and banne in every way.