> independent judges

Judges are independent in Germany. Prosecutors are not.

> Because of this international warrants which come from Germany do not get followed since they can’t be trusted.

I think you mean the European Arrest Warrant[1], and you are right that it is not accepted when issued by German prosecuters, because they are not indepepndent[2]

[1] https://en.wikipedia.org/wiki/European_Arrest_Warrant [2] https://de.wikipedia.org/wiki/Europ%C3%A4ischer_Haftbefehl#D... [2]