I thought the government said that they couldn’t ban abortion because they couldn’t regulate morality.
This street seems to have a one-way sign, doesn't it?
Roe v. Wade was not based on a ruling that said regulating morality alone was unconstitutional, it was based on a judicially created “right to privacy” that the Supreme Court had invented in a ruling just a few years earlier. For more information on that, see http://www.stevelackner.com/2011/02/penumbras-formed-by-emanations-truth.html