Ratzinger has several times gone on record on his supposedly "problematic" past. In the 1997 book Salt of the Earth, Ratzinger is asked whether he was ever in the Hitler Youth.
"At first we weren't," he says, speaking of himself and his older brother, "but when the compulsory Hitler Youth was introduced in 1941, my brother was obliged to join. I was still too young, but later as a seminarian, I was registered in the Hitler Youth. As soon as I was out of the seminary, I never went back. And that was difficult because the tuition reduction, which I really needed, was tied to proof of attendance at the Hitler Youth.
"Thank goodness there was a very understanding mathematics professor. He himself was a Nazi, but an honest man, and said to me, 'Just go once to get the document so we have it...' When he saw that I simply didn't want to, he said, 'I understand, I'll take care of it' and so I was able to stay free of it."
Ratzinger says this again in his own memoirs, printed in 1998. In his 2002 biography of the cardinal, John Allen, Jr. of the National Catholic Reporter wrote in detail about those events.
Similarly, the AP article on Pope Benedict XVI's election stated:
In his memoirs, he wrote of being enrolled in Hitler's Nazi youth movement against his will when he was 14 in 1941, when membership was compulsory. He says he was soon let out because of his studies for the priesthood.
Two years later, he was drafted into a Nazi anti-aircraft unit as a helper, a common fate for teenage boys too young to be soldiers. Enrolled as a soldier at 18, in the last months of the war, he barely finished basic training.
And he's no anti-Semite either, as the JPost column linked in the title indicates:
. . . throughout his service in the church, Ratzinger has distinguished himself in the field of Jewish-Catholic relations.
As prefect of the Doctrine of the Faith, Ratzinger played an instrumental role in the Vatican's revolutionary reconciliation with the Jews under John Paul II. He personally prepared Memory and Reconciliation, the 2000 document outlining the church's historical "errors" in its treatment of Jews. And as president of the Pontifical Biblical Commission, Ratzinger oversaw the preparation of The Jewish People and Their Sacred Scriptures in the Christian Bible, a milestone theological explanation for the Jews' rejection of Jesus.