Do we expect the Pope to be perfect? Only Jesus Christ, true God and true man, was perfect.
Popes, Cardinals and Bishops make stupid decisions just like Judges, Prosecutors, Police, Presidents and Congresses often make stupid decisions.
Religious authorities presented Christ to the secular authority to be crucified. It looks like they may still be.
It seems that just when you think that the worst has passed over this priest sex scandal issue that something else crops up. (Full story about the latest accusation against the Holy Father here).
It's because we are all sinners, from the most exalted Cardinal to the lowliest layman. The Church is a hospital for sinners. You don't need to conduct a survey to know that 100% of the membership of the Church consists of sinners.