It all matters where you believe rights start at.
If you believe the unborn (up to a certain age) don't have rights then pro-choice is the libertarian stance.
If you believe the unborn have rights, then pro-life is the libertarian stance.
Ron Paul himself has delivered 4,000 babies and is very pro-life. One of his arguments is he can get sued if something happens with the unborn baby/fetus.....that would mean the fetus has rights.
It's probably pretty close to a 50-50 split for libertarians....I wouldn't say either is the more libertarian stance. It all depends on beliefs.
To me, it is even deeper than that. I think it depends on where you really believe life begins at. Conception? Birth? Somewhere in the middle? I don't think this is really a political issue but more of a moral one. Most people make the decision on whether they are for or against abortion based on their beliefs, their family and community influence, etc. I don't think the government should be involved with abortion either way. If you want to get one, you should find a doctor who shares your beliefs that will actually do the procedure. But aborting a birth affects you, your relationship with the person you conceived with, your family, etc.
There is an important distinction made here. Libertarianism (more specifically the deontological libertarianism I see mostly expressed by people on this forum as opposed to the consequentialist variety favoured by people like David Friedman) is a political philosophy that says that noone, including the government, may initiate violence against persons or their property. These persons have claims against all other people called rights. The reason that self-identified libertarians disagree on abortion policy is not that their political philosophy differs, but because they have a different notion of at what point personhood begins and rights are acquired. NB: the dispute is not over when life begins, many libertarians would concede that a 1 day old foetus and a adult cow are both alive, but that both may be killed because neither of them are rights-possessing persons.
In summation, libertarianism, which is purely a political philosophy and not an entire moral theory (all of you know that there can be atheist libertarians & Christian libertarians with real disagreements over moral issues) while it can resolve issues like whether taxation or involuntary detention ought to be licit, cannot determine alone whether abortion should be. Some further moral view about personhood is necessary. There is no single libertarian view on abortion.
If I may make some appeal to authority, the Walter Block includes abortion (along with immigration, incitement, and voluntary slave contracts) as one issue on which libertarians may legitimately disagree. I also strongly recommend his lecture and articles[pdf] on the topic of abortion for a compelling and characteristically radical solution to the abortion dilemna, which he characterizes as a compromise between standard pro-life and pro-choice views.
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