If you read primary sources it is obvious that many people are aware of what is happening but none felt powerful to act, a situation not that dissimilar to our present.
a) It is irrelevant what you "think so", that is not an argument. Weimar Republic indeed did have a secret police, Gestapo was modelled from that.
b) You are probably referring to the subsequent Holocaust and World War 2. If so, argumenting with Weimar Republic and drawing a quick installment of aforementioned practices from it is a straw man argument. You create a notion of how Weimar Republic immediately, "on a moment notice", preceded WW2 etc. (which is incorrect) and then beat that notion (incorrectly) into dust. All of that was built gradually from 1933, which is 6 years before WW2 and 9 years before Wannsee Conference.