"So if Granny has pneumonia or septicaemia, you can call it a natural process ..." and treat it.

However, if you decide Granny's in too much pain, and you increase her painkiller to kill her, naught naughty.

The moral issue has to do with terminating the process. Life is a gift from God, human life is the highest gift in our creation, and terminating the process involves taking on yourself God's role.

That similarly resolves the "huge number of fertilized ova which don't attach to the mother's cells".

Bernardin, btw, supported this analysis and after folks like yourself turned “seamless garment” into something else, made it crystal clear that he had nothing to do with your position.