Honestly the efforts made to prevent fascism in Germany were pretty limited, especially on the western side. There were less people punished for Nazi war crimes at Nuremburg than there was staff at Auschwitz. A lot of industrialists and business owners who supported the Nazi party were allowed to keep their business and even official positions. There were Nazi officials who basically got a finger wag and their position back with a promise to be good this time.

They’ve been getting worse and worse about actually preventing Nazis from engaging with official politics recently as well