This issue seems to me to strike at the heart of libertarianism. Should the state be allowed to restrict human freedom based upon moral virtues? I say no.
Pretty much all libertarians (as well as non-libertarians) would agree that using violent force may be appropriate to prevent aggression against a third party. Even anarchist libertarians will generally agree that it's OK even for the state to do so (since they don't argue that the state should be prohibited from doing what a private citizen may do -- but only that the state should not have special authorities to do what a private citizen may not).So even the most extreme form of libertarian would argue that, if you're about to choke your neighbor to death, the state may intervene to forcibly stop you.Whether a fetus has the same value or the same rights as your neighbor is not a question of libertarian versus non-libertarian philosophy. It really has nothing to do with libertarianism one way or the other.For libertarians who do think that a fetus has the same value and rights as your neighbor, prohibiting abortion may be morally justified.Abortion isn't a libertarian versus non-libertarian issue, as far as I can tell -- except perhaps to the extent that libertarians, more than non-libertarians, may recognize the practical difficulties and likely counterproductive results associated with creating "victimless" crimes (i.e., crimes where there is no complaining witness). But that is merely a practical consideration, not a moral one -- and anyway not all libertarians are known for being practical.
I strongly disagree with you. Earlier, I posted an essay that argues why abortion rights is indeed a libertarian position- not a pratical issue but a moral one, based upon the rights of man. The issue of a fetus having value is irrelevant to the discussion.Let's suppose that I created a device that allowed me to shrink in size and teleport myself, and let's suppose I teleported myself into your stomach. What rights does the state grant me now that I am in your stomach? The answer is: none. You, on the other hand, have the right to dislodge me from your stomach in any way you choose, including killing me. If the state were to say, no, you have to undergo an operation at which point timschochet will be safely removed from your stomach, and any other action you take would be illegal, that is a violation of your natural rights. It is your stomach, not the state's. This is absolutely a libertarian position, and IMO, the ONLY position fully consistent with libertarian values.