We didn't know. When the United States Supreme Court first legalized Roe v. Wade, Frederica Mathewes-Green had a bumper sticker on her car: "Don't labor under a misconception; legalize abortion." She's since changed her mind about that. Reflecting in 2016, she wrote: "At the time, we didn't have much understanding of what abortion was. We knew nothing of fetal development. We consistently termed t…