...but the scary message of the movie and the experiment is that totalitarian elements creep in slowly, and possibly change their nature in different times.
Hitler became dictator of Germany by the Enabling Act on March 23, 1933, less than two months after he was voted Chancellor. He then absolved the remaining political parties by Summer 1933, less than half a year after obtaining power. Creep in slowly?
As many have pointed out, the idea that this is a German phenomenon is ridiculous. Unfortunately there are many people who still think there is something inherently German that allowed this to happen.
I think too that this is not a specific German phenomenon, but mainstream German culture is particularly susceptible to some manifestations of it. As mentioned in other threads in this forum, there is a certain state of mind that is very pronounced in German thinking, that once there is a law, you can do anything as long as you're not breaking it explicitly. Or, as Lenin put it once - There will never be a revolution in Germany, because you're not allowed to step on the grass (said mainly in light of the 1948 "spring of nations" which basically skipped over Germany and Austro-Hungary).
Couple that with an awe and unrestrained respect for authority, especially in uniform, and you have all the eggs you need to cook the totalitarian omelette.