The thing I most hate about the modern world is its phenomenal lack of memory about things moral and of ancient roots.
Some people of conscience avoided serving in the Hitler Youth, and many avoided their subsequent service in Hitler's army. Ratzinger did not, and he did not desert the Hitler army until it was quite clear that the Allies were going to overrun Germany, much like his carefully morally ambiguous Pope--and apparent mentor--, at the time, Pius the Silent.
And the basic concern is the same then as in the last 25 years--when Ratzinger's job has been to prevent the church from having to defend itself in an open market of ideas, as the head of the inquisition.
I like my Popes to take more seriously their moral duty to be the Voice of Peter in defense of the wretched and poor and dissident, the natural victims of war and persecutions, and less seriously their duties to cover their own, or their churches, asses, than has been Ratzinger's history. The head of the inquisition--, whose opinions of other religions, older than his, has been openly derogatory and dismissive, whose opinions of nazi anti-semitism were, in interpretation of his actions, sort of neutral--is hardly a promising choice for a church that just managed a strained and strangled apology for its nasty behavior and remarks toward jews for 1400 years, acknowledging its own guilt in securing the intellectual environment Hitler's genocides of the Jews thrived on--said which, apparently, filled Ratzinger only with a mild distaste--rather like any number of Popes one might name who vigorously flailed on jews whenever opportunities arose.
The selection of Ratzinger is giving the finger to the rest of the world whose religeous predelictions vary from the Throne of Peter, and who have enough of a moral memory to remember what religeon invented crusades and thumbscrews as a form of evangelism.