Any detailed analysis of German history would quickly reveal they started under the Weimar Republic ~ an entity frequently forgotten.
All the Nazis had to do was run Weimar nonsense into the ground, which they did!
Politically there was a very precise movement from the old royal system, into a rather mixed Communist/Socialist conflict, from there to a period of peace brought about by vast hyperinflation (your debts got erased), and from there to something more organized that allowed Hitler to renounce the SA and then become acceptable, and from that to complete totalitarian rule.
Parallel with all of that you had the phenomenon of Weimar Culture ~ that's when they started killing inconvenient people.
Europe, in general, is rapidly returning to that stage of development with the extension of euthenasia and abortion.
Think about it, there's no rational reason why the EU or any other state needs to require a member state provide abortion ~ yet, the EU does demand that.
The United States' has it's own Weimar problem. There's New York, Massachusetts, Illinois, Maryland and California ~ all hyper Leftwing states. Their laws have been molded by extremists to resemble Weimar and they are already on their way to third-world status with ever increasing levels of violence.
People in those states appear to be unable to resist the totalitarians ~ just like the Germans. Just a matter of time and you'll have the little Hitlers running around ~ probably named Cuomo.