I think it is far more complex than that, although that probably was the case for a few of them.  I think most entered for idealistic reasons, perhaps in the older days, for a roof over their heads.  I think many in the Irish culture, and that accounts for many of the abuser names, entered because mammy wanted them to and there was a dysfunctional relationship going on between mammy and pappy and son, centered around mammy pushing away pappy for fear of having to get pregnant again.  All sorts of aspects of this dynamic need to be looked at, including alcohol and domestic violence.   Lots of boys/ men were destroyed by the church by their parents, particularly their mothers, in order to become priests.  There is/was a huge amount of virgin worship in the church, and a huge amount of mother worship.  There also, as has been pointed out, a huge amount of women are disgusting oozing creatures feeling among some of the clergy.   Read again:  boys were destroyed.  So were future mothers.