I am pro-choice, but I do firmly believe that if you are pro-life there can be no grey area. Either life begins at conception and is - as he put it - sacrosanct from that point, or it doesn't. You can't say "Oh I'm against abortion - EXCEPT for circumstances a, b, c and d. And sometimes e and f. And g, in certain situations." Which is why the American pro-life movement pisses me off so much, because it is patently a "pro-choice, but less choice, and we want to control women's bodies" movement, not true pro-life (I abhor the pro-life movement equally, fwiw).
I disagree with him, but he is being honest and open about a very unpopular and controversial position, and people complain enough about duplicitousness in politicians as it is. He is also notably expressing his personal opinion while being very clear that his personal view has no impact on anybody's rights. It is just an opinion. Or does he have form for trying to impose this belief on anybody (outside his marriage!!!)?
How can you square being a staunch monarchist (wikipedia) and a Catholic though? Surely there are some theological and political contradictions in there?