It’s because the Catholic Church has permitted homosexuals to be in the Priesthood under the premise that these people can control their urge to bugger boys. You can’t invite a viper into your house and expect that it won’t attack defenceless children. At one point I would have said the Church leadership was naive, but there is no longer any excuse to permit any homosexual into any leadership position in the Church. Sadly, Pope Francis is making things worse.
When Benedict was pope he was doing the Lenten Stations of the Cross, at I think the Coliseum in Rome, when he sort of physically collapsed as if he were clutching his chest. He complained bitterly about all the pedophile priests. With what all he and JPII had accomplished in their collective papal terms, the Catechism, a vast repair of the Church, the many good bishops put into place, the many insightful encyclicals - the realization of the depth of evil in some men was too much for him.