That’s actually a good question.
Just so I understand, the example is someone who is a Catholic, believes in the Catholic faith, adheres to it, however has a personal pro-abortion belief though does not vote in favor of it or promote it – is this the scenario?
This could be a temptation the guy is dealing with, though has not submitted to it.
If you took someone on the opposite end, like Vice President Joe Biden for example who is a baptized Catholics and says he is pro-life but works in favor to promote abortion and says he won’t impose his pro-life position, this is actually worse, because he is claiming to know the truth but rejecting it anyway. Where as the other guy does personally believe in abortion (which is wrong) but chooses to stay by Church teaching.
It would be a good idea for the guy to learn and grow and overcome the temptation to support abortion, but that is far better than actually being actively pro-abortion.
Better “I am personally pro-choice but will continue to support the pro-life effort” and “I am personally pro-life but won’t stop someone from killing her child.”