Why? Well, because they discovered that the child Mrs. Lavedas was carrying was gay, and, given the statistics and their own interests and opinions, they thought their child would have a very difficult life, and his sexual predilections would make their own life difficult as well.
So, having absorbed and assented to all the arguments proffered over the years in defense of a woman's right to choose, they opted to abort the child.
Lavedas tells their story here. His account is in fact a clever satire, but it's worth trying to imagine how those who defend a woman's right to choose would respond, as Lavedas tells it, to the mother's choice when her choice transgresses the boundaries of progressive orthodoxy.
Here's his lede:
My girlfriend and I recently found out she is pregnant. I told her I’d support her and the baby, and secretly started saving for an engagement ring. She said she thought I would have wanted her to get an abortion. I didn’t—at least at first.So here's a question for our left-leaning friends: Would it be okay for parents in Lavedas' position to abort their child because it's gay?
She was excited and started planning the nursery. It took me two months to save up, but I finally got on one knee and popped the question. She cried and said yes. I’m still scared about being a dad, but I’ve got a good job and so does she. We’ll make a great family, just the three of us.
Last week, though, she went in for a checkup. We decided to get full fetal blood work done. Everyone’s doing it; the doctor said there is little risk to the fetus, and better safe than sorry, right? I’m sure everything will be fine, and we’ll learn the sex. I really hope it’s a boy.
Oh, and we decided to make everything official with a trip to the courthouse. We are married now!
Well, got the blood work results, and there’s good news and bad news. Good news: It’s a boy and he’s healthy. Bad news: He’s gay. I didn’t even know there was a blood test for that now, but I guess it’s new? They found the genes that cause homosexuality and they test for them now.
Read the whole essay at the link. It's not long, but it does put a lot of pro-choicers in a bit of a logical pickle and offers a serious and rather unique challenge to their rationalizations.