Because, as I tried to explain, the Church teaches that she is infallible in the matters of faith and morals, and also teaches that individual Catholics can be fallible in all matters, and that, finally, cooperation with the torturers was wrong whoever was guilty of it. The fact that the Church is in fact as a whole fallible in matters of politics or science can be deduced but it is not expressly taught.
Perhaps, that is because it is not really the business of the Church to fiigure out economics or astronomy. There was a time when everybody thohgh that the Earth is flat. It follows that everybody in the Church thought that the Earth is flat. So every single Catholic was in objective error. But on the other hand, the Church never taught anything about the shape of the world, and the Church cannot be at fault for something she did not teach as an institution.
We have a real conundrum here, like a hospital grading a surgeon based on whether he can ride a bicycle.
If the church is infallible in the matter of faith and morals, then its not dealing with priests who molest children is what then?
How can you justify, excuse, or explain separating the "Church" as an organization or institution from the individuals who comprise it? How can the *Church* make any pronouncements without the men who make it up making those decisions and pronouncements?