Really, why would you think that?
Because of Stasi? That was quarter a century ago. Almost forgotten. Ask representative sample of Germans what was Stasi and, I strongly assume, most wouldn't know anything about it. Especially the younger generation. Sadly.
Or because of Nazi time? Despite Hitler (and Hitler-related) documentaries being constantly shown in German TV, most Germans are still not aware of the methods being used by the Nazis to keep Germans under surveillance during that time. Sadly.
And, if lots of people do go out and do demonstrate/voice their discontent?
In October 2015 250,000 people demonstrated in Berlin against TTIP (for US friends: EU-USA TPP) [1] and what did "das Merkel" do? Nothing, it's TTIP full steam ahead!
Then 1.6 million Germans (together with 3.3 million EU citizens in total) signed a petition against TTIP. Government spokeperson: "Merkel will not receive a petition". [2]
Recently, "over 300,000" people have demonstrated against TTIP and CETA (for US friends: EU-Canada TPP) and what was the reaction of the Government? "It's their right to demonstrate". [3]
Has anything changed in the policy of the German government after all these democratic means? I think you can answer this question yourself.
This system we live in doesn't work. It probably never did, but we didn't notice it.
[1] https://www.theguardian.com/world/2015/oct/10/berlin-anti-tt...