Europeans aren’t pre-disposed toward nazism but they are pre-disposed toward highly centralized government. That may manifest itself in any number of ways historically. Socialism of various kinds, fascisms of various kinds and various levels of intrusiveness, and obviously the monarchies that preceded the modern era.
Europe has never been fertile ground for classic liberalism, de-centralized and distributed power except as imposed by necessity, they seem forever to gravitate toward ever more centralized solutions.
I may be wrong, but thats my observation.
The Medici were a pretty rowdy bunch.