Bet you thought Roe V. Wade was only about abortion. It isn't. Oh, abortion is what it is known for- but it had a secondary effect.
It expanded the Interstate Commerce Clause to Intrastate Commerce.
It claims that Congress has the right to regulate business transactions that occur entirely internally to a State. This is a MAJOR grab of federal power- and while not the first, prevents lower and smaller government from taking absolute power locally.
Subsidiarity is a Catholic ethical concept that can be simply stated as "Big Government creates corruption, so any just duty of government should be carried out with the smallest economic unit of government available". Austrian economists have a tendency to agree- that's what SMALL government is all about.
So therefore- even pro-choice libertarians, should seek the reversal of Roe V. Wade. Not because it's against abortion- but because it's against subsidiarity.