Reversing Roe v Wade is not the same thing as banning abortion. Abortion never belonged in the courts to begin with. It is consistent to oppose the judicial activism that forced abortion on demand onto the states just as it would be to use judicial activism to force "gay marriage" on the states.
Exactly! As long as Roe stands, it serves as a precedent for judicial supremacy on a whole host of issues. And judicial supremacy is incompatible with conservatism and a republican form of government.