You need to understand the Catholic perspective to see why this is unacceptable. I am loath to use a Wikki link but they do seem to cover it pretty well here click here just scroll down to "Catholic prespective".
The unmarried and celibate priest puts God first and devotes all his energies to God. If I didn't think that the vast majority of Catholic priests have nothing to do with this scandal, I couldn't be a Catholic.
Evil people get themselves into trusted positions so that they can do what they want. Allowing them to marry isn't going to change the fact that they are evil. They don't do evil things because they don't have wives, they do evil things because they are evil.
The scandal needs to be dealt with, the criminals and those who covered up for them need to be thrown out of the church, they are not men of God; and the full force of the Criminal Justice system should be thrown at them.