Tolerance of political views? Do you mean the 20 odd % that are now voting for the right wing AfD and the only 4% voting for the green party?
Freedom of speech is part of the "Grundgesetz" (Basic Law). From 1948 written to stop another dictator ever getting into power in the future.
The Basic Law places at its head a guarantee of inviolable fundamental rights. Initially it was intended to limit these to classic formulations of civil freedoms, as with equality before the law, freedom of speech, freedom of assembly, freedom of occupation and freedom of religious conscience.