I would be inclined to agree with you, except that Islam blurs the line between faith and politics, and as such -- whenever it achieves political control -- always imposes a totalitarian system as horrific is Naziism, communism and all the other tyrannical "isms" that have caused so much death, poverty, misery and oppression.
It is when Muslims cross the line from faith to politics that they become the enemy, the "good Germans" notwithstanding.
The phenomenon of the “good German” is like Spanish flu, which didn’t start in Spain and wasn’t limited to Spain.
We’re all susceptible to some degree.