For the government to selectively follow laws, saying that in this case they don't apply since they don't give us the right result, makes a mockery of the very idea of having laws.
Whereas if one acts for the "wrong" reasons, then that will only rarely result in doing the "right" thing.
One can look back at the original Roe v Wade and say "The right thing was done here, the outcome was good", but having that sort of consequentialist outlook tends to blind people to the downside of having the right things done for the wrong reasons- which is as we see here, those wrong reasons can in the future easily lead to the undoing of the right thing.
The original Roe v Wade decision meant that Congress never had to pass a law that explicitly nationally legalized abortion. If they had, the current situation wouldn't exist.