the babies died at a rate of about twenty per year, and of natural causes.

A death rate that high is NOT natural. It implies lethal neglect. Anybody responsible in a secular institution would be facing criminal proceedings - those nuns killed far more children than any 19th century baby farmer. Instead, what's happened is that their accomplices in the Church hierarchy have conspired to keep them beyond the reach of the law.

If you're right, their superiors were not always the local Church organization and they were directly accountable to the Pope. Fine, extradite Ratzinger for perverting the course of justice. He was the main man in charge in charge while his senile fascist boss was gibbering his way into the same mental state as his pal Ronnie Reagan.