In the beginning, even after the "Machtergreifung", it was fairly ok to insult Hitler and make fun of the Nazis. They thought, its a form of venting for the population, preventing REAL resistance. Though, this changed later. There is a good ARTE documentary about this "Humor unterm Hakenkreuz".
So, regarding the US... just wait a while...
I - as my personal opinion - think he is more a case for the 2nd amendment...