Rudy Giuliani can hardly be held up to be an exemplary Catholic.
Where would you draw the line? What about murder, theft, adultery and all the proscriptions of the Ten Commandments? What if someone confesses to homosexual activity in a jurisdiction where such behaviour is against the law and viewed as equally criminal to child abuse? 
Should we be obliged to confess speeding offences and turn ourselves in in order to receive absolution?
Why would a priest confess to a brother priest to obtain absolution when he knew perfectly well that his own disposition would preclude him from receiving that absolution whether his confessor granted it or not? If a paedophile priest believes that he can obtain absolution and continue to molest children then on top of his paedophilia, he has a serious mental problem.