Confirmation bias much? Your experience is a) your own only, b) not really applicable outside the US, and c) only your own.
From their reputation, american police are a lot "harder" than the police around here, so I am a bit suspect about that. My personal encounters with the police are limited to one stop-and-search incident involving them suspecting me to have drugs in my pockets (A rather painless incident I was able to talk myself out of because I was, in fact, able to bamboozle the officers with my eloquence and obvious not-drugged-ness).
Now, I am not saying that my experience is in any way applicable to the entirety of all possible encounters one can have with the german police, but there you go.
That being said, deprogramming yourself of the automatic memetically determined reflex to tell the police something when they ask you, is much, much harder than it sounds (example in the vid, where the Officer asked about speeding on the highway).