That's one possible framing. But from their perspective, they are defending the lives of innocents from those who wish to do them harm. If one accepts their framing of the issue, that's a righteous cause indeed. Why is your framing accurate, and theirs inaccurate?

You're doing what so many people do in the abortion debate, and begging the question. You can't simply sidestep deep differences of opinion on moral issues by declaring your position to be right and theirs wrong. It's wilful ignorance of a whole lot of nuance that exists on this topic, nuance that must be engaged with if one wishes to be effective in having a discussion.

Their framing needs to acknowledge that the fetus is part of the mother's body, not an independent life, and that child birth has risks. Thus the autonomy of the mother over her own body has to be part of the discussion. Their framing can't depend on a soul entering at conception, or God/their sacred scripture telling them abortion is murder. That's not a rational or legal basis for compelling other people who don't believe that way.

If they want to enter a scientific discussion on viability and neural development for when to start placing limits on abortion, and how making victims of rape or incest carry to term is ethical, then we can have a meaningful discussion.

Otherwise, they can feel free to go have their own theocratic community in the wilderness where they don't choose to have abortion. Also known as Alabama these days, unfortunately for those stuck wandering the wilderness with them.