This chart shows why abortion is a complicated issue:
A pro-life libertarian (since the chart really pertains to a libertarian POV) would answer: Yes, no, life
A pro-choice libertarian would likely not see the fetus as having a life worthy of legal protection, and would say no victim, no crime.
The other glaring aspect of this (and libertarians recognize this aspect for many things, not just abortion) is that making something illegal doesn't make it go away, and often times makes it more dangerous.
As another famous libertarian once said (on the topic of prostitution): "It's not illegal because it's dangerous...it's dangerous because it's illegal"
I think abortion would fit in with that in many regards. If you take away the safe, sterile environment, staffed with knowlegeable people, you end up with a potentially dangerous situation.
but the more pertinent question in this day and age is: if abortion is legal, should the government pay for it? The only reasoned libertarian answer that I can think of to that question is a resounding no, regardless of when that person defines the beginning of human life.
I would agree that the government and other tax payers shouldn't be paying for it...I think it should remain legal, and safe access to it remain in place, however, I'd concur that everyone shouldn't be having to chip in for this given some of the statistics we know about abortions that take place, for example:
Of the abortions that take place, the reason cited in 46% of cases was "not using contraception", nearly another 20% is "not using contraception properly", and 23% of them are repeat customers. Contraception failures, Rape, Incest, and health issues make up the smallest piece of the pie in terms of reasons for getting one (even though the die-hard pro choice crowd makes those few outliers the core of the argument in order to give it a noble sounding purpose).
The necessity for such a large number of abortions is still largely driven by the aspect of irresponsibility. Until that changes, I'm not a fan of the government cutting checks to pay for a $1200 procedure that should've been a $12 pack of condoms.
But like I mentioned earlier, I'm technically "pro-choice" in terms of keeping abortion legal...however, some pro choice people would take the attitude of "anything less than 100% compliance with our agenda means you don't respect womens' rights"