The brief opinion piece meanders a bit, dredges up Rembert Weakland and mentions natural law, then declines to offer an actual opinion, instead opening the question to reader comments.
There are various opinions, tending toward "breaking your vow is breaking your vow." And then one "American1942," gets is exactly right: The big issue isn't whether the priest has sex with a man or a woman. The big issue is whether the priest has sex with somebody in his parish.
Duh. That's the real ethical breach, and that is where souls and their relationship to Christ are truly endangered. Understanding as much probably explains the comparative tolerance extended to vow-violating priests in some countries, especially the Latin ones. Our question is why the dopes at USA Today didn't start a discussion about that.
Probably because it's USA Today. Ugh.