So you think Scalia is totally dispassionate on this issue?
Based on my readings, which include many of his dissents in key cases, as well as a book he published where he debates Lawrence Tribe and others, as well as transcripts of speeches and lectures he's given, I believe he is quite capable of doing his duty appropriately.
I think he is frequently passionate in his arguments. He brings quite a bit of passion to the job. But that passion is directed at judging law, interpreting law, being a steward of the Constitution, upholding our republican system, and most of all, resisting with all his force the tendency of the court to just go with what they think and feel, and to hell with the law, we'll come up with a fancy argument for the outcome we want.
Do I think he has a personal view on abortion? I think the odds are he is against abortion in most cases, maybe all. I don't believe he judges the way he does to accommodate his view on abortion. I think he rightly emphasizes and acknowledges the passion surrounding the issue.
But all of that is moot: What does he say professionally? He says the states should be free to decide for themselves.