Science has dictated the standard lib response. In the days of Roe v. Wade, there was no sonogram to show brain activity and differentation as early as 8 weeks. People can see that the unborn child is just that a growing child who happens to be in a biological incubator. At some point, science will provide a mechanical incubator (I will invest in that and will make a mint), as Justice O'Connor often postulated, then what? Libs know this and are preparing to argue that a woman has the absolute right to choose, despite science and viability. So they say safe, legal, and rare because science is not on their side in the long run.