There's really very little to say, here.
Mahony should have been sacked a long time ago. He's a destroyer, and apparently a pervert. Or at least a pervert-enabler. And, once again, the unspeakable truth.
We had a sexual abuse problem because malfeasant bishops deliberately, knowingly admitted homosexual perverts to the seminaries and bishops deliberately, knowingly ordained homosexual perverts to the presbyterate. The malfeasant bishops who did this, did it in spite of clear direction from the Pope that homosexual perverts were to be excluded from the clergy.
ANY organization, particularly one that deals extensively with children, that admits homosexual perverts to its leadership will have serious problems.