You make the assumption that folks come to pro choice easy. That is just not the case.
I have always been mystified that the question comes to viability yet when push come to shove the answer from prolife is conception. There is so much that is incorrect with that logic that it befuddles me. So, using your example in paragraph four. If you know when a fetus is NOT viable, your argument against the pro choice folks is fully nullified.
Add in the hypocrisy of many pro-lifers who have no problem with the death penalty or starting or instigating war and the concept of the pro-life advocate become very diluted.
I have a very good friend who I respect greatly that is pro-life. He is also strongly against the death penalty and strongly against war and conflict of all types. HE is truly PRO LIFE. Most of the rest of the group are a hodge podge of compromise.
I make no assumptions about how easy or difficult it is for people to decide to have an abortion; I only know that I find it's legality fallacious when confronted with laws that, among other things, consider killing a pregnant woman to be double-homicide - as just one example.
I'm not claiming to be pro-life; I think that term oversimplifies a very complicated issue. An orderly society implements consequences and punishments for those who violate the life and liberty of others...I have no issues with the death penalty in this regard, and linking that to a desire to repeal abortion laws is unreasonable. One involves an eye-for-an-eye punishment for only the most egregious crimes; the other involves terminating a life out of convenience - and it's the convenience aspect that is at issue, not this mother's life is endangered or rape/incest bullshit.
Plainly, it would help everyone to know what "tests" a fetus must pass to be considered viable, and it should fail all of them prior to a doctor being allowed to perform an abortion. Until such time as those are defined, again, the only rational and humane course is to assume the fetus will be viable. And thusly, terminating it is a form of homicide or manslaughter or whatever you want to call it. There is premeditation involved, so, you know, murder isn't an entirely inappropriate term.