I suppose if would depend on whether you believe that inaction leading to more death is more ethical then actively choosing to murder one life to save the other.
Let's look at the same problem but swap out the actors. Say you have one man with a mortal wound to his heart, and another man with a mortal wound to his lungs. Both will probably die, both men have families, and neither wants to die. Is it ethical to murder one man without his consent and harvest the deceased's organs to save the other?
That's a bad analogy. Let's change it: the man with a mortal lung wound could use the lungs from the man with the mortal heart wound, but the reverse is not true for some reason involving tissue compatibility. So if nothing is done, both men die. If the heart man is killed and his lungs harvested, the lung man will live. If the lung man is killed, both men die. So either both men die, or the lung man lives. On top of all of this, the heart man is braindead, so he has no opinion and no ability to make a decision, and no real chance at a future anyway.
I'd say it's perfectly ethical to kill the man with the mortal heart wound and take his lungs.
Technically, "not aborting" may always cause the mother to die since childbirth always carries some risk. But if you mean a case where the fetus is already dead, I doubt many people would oppose the abortion? What are their arguments? I genuinely can't think of any. Maybe this is just a case of the law being ambiguously written and doctors erring on the safer side?
Which state is that? I thought the strictest laws at the moment were in Alabama, which does allow abortions in the case of a serious risk to the mother's life.
There is a huge list of counteragents someone could make if they start from that basis, and your counterpoint does nothing to impact them.
Everyone is talking past each other with arguments which make sense to them, but are largely off target for the other person.