I wasn't aware that unborn children was a loaded term... It seems to me that they may be using that term to refer to "the entire gamut of zygote, embryo, fetus, etc.". I know, it's crazy we wrap up ideas like this into a pithy little phrase. It's almost as if the English language has short phrases that are useful to discuss things at a broader level. Crazy right?
> Is it really that impossible for the anti-choice movement to make a reasoned argument?
Well what is a reasoned argument? Google says that reason is "a cause, explanation, or justification for an action or event.". So it seems to me that if somebody offers any explanation, that fulfills a reasoned argument. But perhaps you mean well-reasoned. And that is a subjective argument contingent on what you mean by well.
> To cite legitimate science?
Yes you can argue pro life and cite legitimate science [1]. But like this article says, you'll probably pull out your prejudice and immediately dismiss any scientific evidence that supports pro life. In addition to that, science is funded by people with agendas. Like the article also says:
>> As often as not, scientists dive into the debate, taking funding from pro-life or pro-choice organizations or openly advancing an ideological position. This, too, has consequences: It casts doubt on the validity and integrity of any researcher in bioethics-related fields. “Anybody with money can get a scientist to say what they want them to say,” Largent says. “That’s not because scientists are whores. It’s because the world is a really complex place, and there are ways that you can craft a scientific investigation to lend credence to one side or another.”
So claiming illegitimate science is just a No True Scotsman's fallacy. A true scientist would never come to a pro life conclusion, therefore you must be a false scientist.
> that doesn't involve religion or tradition?
An atheist's point of view seems like it would not involve either religion or tradition [0].
[0]: https://www.americamagazine.org/politics-society/2017/10/19/...
[1]: https://www.theatlantic.com/politics/archive/2018/01/pro-lif...