Roe was essentially established in the first place because liberal justices said "because we say so". And now we have the current justices saying "no, that's not how this system works" (and I highly recommend reading their opinion, its not 'because we say so'). Even RBJ has agreed that Roe was a faulty decision.
If you are against "If we say so" rule of government, you might like this supreme court opinion.
There is plenty of precedent for overruling constitutional decisions. From a legal perspective this is not new, see Brown v Board overruling Plessy v Ferg.