[His father served in both the Bavarian State Police (Landespolizei) and the German national Regular Police (Ordnungspolizei) before retiring in 1937 to the town of Traunstein. The Sunday Times described the older Ratzinger as "an anti-Nazi whose attempts to rein in Hitler’s Brown Shirts forced the family to move several times.".......Following his 14th birthday in 1941, he joined the Hitler Youth, membership in which was legally required from March 25, 1939. [7] According to National Catholic Reporter correspondent and biographer John Allen, Ratzinger was an unenthusiastic member who refused to attend meetings. Ratzinger has mentioned that a Nazi mathematics professor arranged reduced tuition payments for him at seminary. This theoretically required documentation of attendance at Hitler Youth activities (deliberately planned at Sunday mornings at that stage, to prevent church attendance) - however, according to Ratzinger, his professor arranged that the young seminary student did not need to attend those gatherings to receive a scholarship.........In late April or early May, days or weeks before the German surrender, Ratzinger deserted. Desertion was widespread during the last weeks of the war, even though punishable by death (executions, frequently extrajudicial, continued to the end)]
http://en.wikipedia.org/wiki/Early_life_of_Pope_Benedict_XVI
It isn't like you seem to be making it sound. It really doesn't discredit him IMHO.
Burn