[2] Carl Friedrich Goerdeler, one of the heads of the German resistance to Nazism, had suggested Sethe as the editor-in-chief of the newspaper that the Widerstand was planning to publish after the 20 July plot.
[3] After World War II Sethe was one of the founding editors of the Frankfurter Allgemeine Zeitung,[4] which developed very soon to the leading national newspapers in Germany.
He announced his resignation 1955 because his co-editors did not share his critical opinion concerning the German foreign policy at that time.
He argued against one-sided ties to the West and for increased contact with the East, which brought him in conflict with the Federal Government and the mainstream at that time.
Sethe always insisted on his opinion that there had been several "missed opportunities" of German politics, for example the Soviet March note of 1952 as a neglected starting point for reunification.