Why do organisations protect sex offenders ?

https://www.newsweek.com/how-catholic-churchs-hierarchy-helps-hide-sexual-abuse-636076

In all these cases, the hierarchical structure of the church made it difficult to bring high-ranking figures to justice. When you give superiors nearly absolute obedience, the threshold for acting against them is high. By the same token, superiors can often protect offending priests.

A presumption of integrity goes with a high position in the Catholic Church. It is often difficult to believe that a bishop could commit or cover up a terrible crime such as rape or sexual abuse. Also, if the Catholic Church is a divine institution necessary for salvation, then there are those who will protect its reputation at all costs.

There is a tipping point, however. The key moment leading to the resignation of Cardinal Law was a letter, signed by 58 priests, asking him to resign.