nazis believed it.
they were a totalitarian movement.
not all germans believed their bullshit.
yes perhaps they should have resisted more, but...... hitler was a plant of swiss bankers.
Hitler was not a plant of Swiss anything.
Indeed, at first, Hitler wanted to attack and conquer Switzerland (operation Tannenbaum). It was never carried out for several reasons:
The Alps were simply to difficult to conquer, especially with mechanized infantry (tanks).
The Swiss could've resisted while defending their homeland for years, having conscripted every able bodied man less than 60 years of age, and having the Alps to fight from.
Swiss defenses were very effective at shooting down aircraft crossing their borders.
Hitler eventually realized that Switzerland was more useful as an independent nation, since the Mark was effectively useless and the Germans could trade gold for Swiss francs.
Hitler had other nations to conquer, and good reason to do so, since Germany was most interested in gaining access to good ports for their navy and merchant marine.
The gold that Germany stole by conquering nations went right to Switzerland to get more Swiss Francs, which were used to prop up the war.
You don't attack your own banker.
Eventually, of course, Germany ran out of places to steal gold from, and thus began the road to their own defeat (again). A defeat more soundly prosecuted by the Allies, formed from nations that Germany had attacked or was planning to attack...yes...even the United States.
Hitler rose to power due to the disaster of the Treaty of Versailles.