well I just don't believe that he sinned in the matter
either he tried to do something and was prevented, or we're not given all the information.. for example, in one of the cases, the priest was already removed from his duties by the diocese, and the Bishop asked the Pope if he should be laicized as well, and the Pope took his time answering but the priest was no longer a threat to anyone... or, in another case, (the priest who molested the deaf boys) - he was already dying when he was found out... so I don't believe that Pope Benedict did anything wrong on purpose, even if he made a mistake.
I was reading about how he met up with abuse victims on Sunday, and I think he's genuine about wanting to reform the Church.