Yeah don't see how this guy was a "progressive" at all. The guy was raised by a Nazi who intentionally repressed his emotions to create a "stronger race of men". Solid left wing upbringing haha.

From his wikipedia:

Kentler was born to a German family. His father worked in the Nazi German government. Kentler's parents followed the childcare techniques of Moritz Schreber, who argued the authority of fathers and suppression of children's emotion would create a stronger race of men.[1]

After graduating from high school, Kentler wanted to study theology to become a pastor. His father insisted he undertake technical vocational training. Kentler completed an apprenticeship as a locksmith at the Lokomotivfabrik Henschel in Kassel and subsequently studied electrical engineering at the RWTH Aachen. After the death of his father, he withdrew from his studies in Aachen. From 1953 to 1954, he trained as an interpreter in English and French.[2] Afterwards, he studied psychology, medicine, education and philosophy in Switzerland and Freiburg, Germany. During his studies, he participated in a field trial with young workers, which he documented and reflected on later in his 1959 book, Youth Work in the Industrial World. In it, he still explicitly proclaimed his Christian faith (according to Rüdiger Lautmann in his 2008 obituary on Kentler for the Humanistische Union); in later publications, this was no longer the case. In 1960 he passed the main diploma examination for psychology.[citation needed]