Not by choice in his youth. Show me where he was antisemitic after WW2, or even before. He was a scholar, even in Hittler Youth he had disciplinary action for not obeying orders or getting with the agenda. I didn't like his views, but he really did tackle the sex abuse in church.
In 1941 every fourteen-year-old was required to join the Hitler Youth . According to a biographer, a cousin of the pope was murdered by the Nazis.
It was not like Prince Bernhard.
Bernhard did admit to being an aspiring member of the SA and the paramilitary Schutzstaffel (SS) . In his 1962 authorized biography, he admits to having worn the brown uniform of the SA and the black uniform of the SS. According to Bernhard, he joined for opportunistic reasons.