This may sound like a wicked question, but is it possible that the priests who petition to leave the priesthood in order to become married perhaps doing the will of God? Perhaps their vocation never was to become a priest, and they were simply persuaded into becoming one…
Not a wicked question at all, though it is one that a lot of (if not most) people don’t think about, or refuse to think about.
I know several laicized priests, as well as a number of men who left seminary through careful discernment. One of them actually left just a few months before ordination, after years of high school and major seminary. Though they all have different reasons for leaving, one thing I’ve heard from all of them is the pressure to be ordained.
Once you’re in seminary, most people (specifically parents and families) expect you to be ordained. It’s not about discernment, it’s not about a possibility… If you’re in the seminary, then in X years you will be a priest. End of story. People who have left the seminary partway through have met a tough time coming home, as if they’ve failed or something. The longer you’re in, the harder it is to consider leaving. So, sadly, there are a number of people being ordained who would agree they shouldn’t be. Whether out of pressure from families, or fear of not knowing what else to do with life, they go ahead and they do it.
So leaving years later, whether for a woman or not, may in many cases be the best thing for them, or for their diocese or parish. Just as in the case of late vocations some men do other things before acknowleding the will of God and following it into the priesthood, so also some men go into the priesthood and later on acknowledge and follow the will of God out.