Not this crap again. All German boys had to be in the Hitler Youth, by law. It wasn't a choice. His family was not pro-Nazi and one of his relatives was murdered in their euthanasia program. He had no choice in it.
Even your own link says:
"
After the Nazi seizure of power, Benedict’s father suffered a demotion due to his opposition to fascist rule, but after Benedict turned 14 in 1941,
he was compulsorily drafted into the Hitler Youth. He was recorded as an "unenthusiastic member." Two years later, he was drafted into an anti-air artillery corps, then trained as infantry,
but deserted his post in 1945 as American forces approached. He was briefly interned in a prisoner-of-war camp until being released at the end of the war."
Wow, what a Nazi.