It was more than "stories" that he was involved in the Hitler Youth; this, from the Washington Times:
"Cardinal Ratzinger's secretary was unavailable for comment when his office was called yesterday, but John Allen Jr., a journalist for the National Catholic Reporter, wrote about the episode in a 2002 biography of the cardinal.
Cardinal Ratzinger "was briefly enrolled in the Hitler Youth in the early 1940s, though he was never a member of the Nazi party," Mr. Allen wrote.
"In 1943, he was conscripted into an anti-aircraft unit guarding a BMW plant outside Munich. Later, Ratzinger was sent to Austria's border with Hungary to erect tank traps. After being shipped back to Bavaria, he deserted. When the war ended, he was an American prisoner of war."
Hey, it's a new development! There is one deserter whom DUers hate.