Child Abuse in the Irish Catholic Church

And lo, it did come to pass, that the head of the Irish Catholic Church (Cardinal Brady) was found to have personally covered up cases of child abuse. Behold, said the Lord, this criminal should be thrown into jail.

As one of three church investigators into two children being abused in the 70s, Cardinal Brady interviewed two boys aged 11 and 14. Following meetings where they described their ordeals, he swore them to secrecy. And when the matter was reported to his then superiors, and the culprit simply moved to a succession of other parishes where the abuse continued for years in his full knowledge, he did nothing.
In failing to report the crimes to the civil authorities and taking steps to prevent the victims from doing so, Brady is guilty of the crime of misprision of felony.

Pathetically, rather than have him answer for this, some of his apologists have sough to employ the Nuremberg defense by suggesting that canon law overrides civil law and that he was doing his duty by following the former.
And the Cardinal, while apologising for his actions "with handsight", has refused to do the decent thing by resigning. He says that he'll only do so if required by the Pope.

But meanwhile, Benedict XVI has issued a mealy-mouthed statement of apology for the abuse by preists, while refusing to address the role of his own heirarchy in allowing it all to happen and covering it up. He seems more concerned in his letter to Irish Catholics, about having a whinge about secular conspiracies against the church.

While further study of this is obviously needed, it would appear to me that the number of paedophiles in the church is grossly out of proportion with the rest of society. So unless there's something about that vocation that attracts paedophiles, I would suggest that instead it breeds them, through it's repressive rules on celibacy.

Why has this institution not been sued out of existence by now?