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People don't molest children because they're celibate. That some folks would suggest that as an explanation is baffling. People molest children because they are sexual deviants. The idea that celibacy leads to pedophilia is baffling to hear, especially coming from a bunch of Christians. I'm sure some will offer the argument, "Ah, but it's lifelong celibacy." Pfah I say to that. As a mostly sexually-healthy heterosexual male, I can personally say that celibacy isn't easy for me, even though I (God willing) will most likely end up married.
It happens in the same way with anger, a restrained temper can lead to a person committing violent crime, if natural and healthy feelings cannot be expressed in a normal way then they all build up and are eventually released in an unnatural and unhealthy way, so if you keep supressing your anger you might one day get in a fight and unintentionally beat someone to death, this has happened.
It's no different with sex crimes, in this context a priest cannot release his sexual frustration with adults or in a public way due to his need to protect his position and so the obvious outlet is children who he has access too and can subdue to keep his position protected.
Obviously a person must be pre-disposed to finding children sexually attractive, but after years and years of supression sexual identity is easily compromised, and that's one more reason forced celibacy is a bad thing.