Although residing in Paris, he was frequently able to travel back to Germany, where he was notably influenced by the death of Benno Ohnesorg in 1967, and the assault on Rudi Dutschke in April 1968.
Meskipun tinggal di Paris, ia seringkali dapat kembali ke Jerman, dan di sana ia terpengaruh oleh pembunuhan Benno Ohnesorg pada 1967, dan serangan terhadap Rudi Dutschke pada April 1968.