Except that I don't think he missed the point. I was just saying that no argument can persuade anybody who thinks that human life is sacred and that a unique human being exists at the moment that intentionally killing it as anything but murder.Which is why my argument in the OP is asking the pro-lifer why they think that humans deserve rights that another lifeforms on this planet don't. One's opinion on the topic (and the prevailing view in society) should have a logical base that scales well throughout the stages of human life.
This is a really long way to say "nuh-uh". While I'm absolutely certain that some people won't bother to honestly engage my counter-argument, that I won't successfully cause every (many... some?) pro-lifer to reconsider their opinion with my argument, it's not helpful to just say "some people won't be swayed" or "this doesn't phase me". I wanted constructive feedback on the quality of the argument. I'm not sure why you're defending Greenman either, just like Jubilex he missed the point entirely.
If you want an argument that persuades people that murder of an unborn human fetus isn't murder you will need one that justifies such a murder. I would suggest that half of the population purely by chance is female and that because conception is the result of sperm fertilizing a ovum with or without conscious intent, half of the population can become pregnant without actual intent. But because the human animal was able to compete and get to the top of the food chain as a result of brain power it is inevitable that brain power would be applied to overcoming this fact of our nature. The Jews simply decided that the soul does not exist in a fetus until sometime after birth allowing for both abortion and the horrible psychological pain at the thought of losing an unborn soul in utero through accidental death.
Alternately, you can view the fact that the right of women to decide who will be used by their bodies as an incubator is absolute and the right to life is also absolute, when two absolutes clash it is up to intelligent people to form their own opinions as to which absolute takes precidence in their individual case.
In short, and in my opinion, I have nothing to say about abortion because I am not a female. It is purely a woman's issue and should never be a decision only so called religious people of any gender get to make.
I could only tell you how I react to your argument. Maybe some would find it appealing, but I can't make myself believe that. Sorry if that is discouraging. It wasn't meant to be personal.