I did know this, and while I find the RCC’s take on this to be entirely wrong-headed, it seems consistent with their views, and the only stand to take that would give their view on ‘regular’ abortions any weight.
If two people are likely going to die, would you condone shooting one of them to let the other live? What if it meant shooting the person who couldn’t object to being shot?*****
If you already believe abortion is murder, then even in a ‘save the life of the mother’ situation the morality is sticky.
***** - I actually am not 100% sure how I feel about that scenario, but let’s go with it