Sanctity of life is pretty absolute!
Just because you have issues with it, as do I, doesn’t mean CK didn’t have a strict moral code that emphasised that value of life over everything else.
Your morality prioritises the wellbeing of a 10-year old. His morality prioritised the right to life of another person (and he - rightly or wrongly - believed that a foetus was a person). You might believe he was monstrous to let a 10-year old suffer. He might have believed you were monstrous for killing a person.
You are both being “moral”, but from different standpoints. That’s very different from being “immoral” - where you behave in a way you know isn’t moral, but do it anyway, or “amoral” - where you don’t have a concept of right or wrong.
You could even argue that CK was very moral in this regard, as there would be many people, especially Christians, who would accept the three principles I outlined in my previous post… but would nonetheless act against their morals to protect their child, even though their morality would hold that preventing their child’s suffering was a less important principle than not taking life.