Hitler got entrenched in power because his economic policies _worked_ in 1930-s. They were broadly Keynesian: state spending to stimulate infrastructure (for the military) and manufacturing (also mostly military). This led to economic growth that people really felt in their wallets: https://commons.wikimedia.org/wiki/File:Economic_development...

And so it resulted in a huge upswing in Nazi support, enabling Hitler to stay in power. People really _loved_ him.

This doesn't work all that well backwards. If peoples' lives keep getting materially worse, it's hard to keep blaming it on "the others".