This logic is the road to ruin for a free people.
People need to realize that the Supreme Court may have made abortion "Constitutional" with Roe v. Wade thirty years ago, but that doesn't make abortion moral or right. The Supreme Court made segregation and, by default, racism legal with Plessy v. Ferguson in 1896; however, 58 years later, the Court came to it's senses and reversed this with Brown v. Board of Education (the fact that Brown has been used to introduce a host of other unconstitutional programs is irrelevant). Hopefully, in the near future, the left will be confronted with the reality that abortion is not and never should have been the "law of the land."