so the solution is to ban abortions, contraceptives, and same-sex marriage altogether?
Look at the political debates likely to come up over the next 10 years and tell me where libertarians are aligned with liberals. Apart from the things I mentioned above, cases that will come up may include the constitutionality of a wealth tax, changes to equal protection to allow discrimination in favor of particular groups, firearms confiscation, etc. (I’m not saying all of these will happen, I’m pointing out what the next legal battlegrounds will be.)
The difference is that—unlike racial justice, women's rights, and gay rights—in this case abortion was a mistake and so the step forward would be to reverse it. If you go back far enough, society has successfully reversed actions that were at the time considered forward progress.