They're fed up with all the homos in the priesthood. It's giving them a bad rap.
Seriously, anyone hear of the lawsuit filed by the Jesuit priest? He claimed that the order he joined was at least 50% gay, and that much of his time there was involved in gay sex parties, planning said parties, outings and such. He claims he was constantly hit on and the sexual advances were so overt and heavy-handed that he was forced to leave the order.
So the Vatican has decided the gays must go.
If the Vatican was any more clueless, it would be president of the United States.
http://observer.guardian.co.uk/international/story/0,6903,1558063,00.html