It's much worse than pro-abort. If you dig into libertarianism's basement you will see that in principle they (crazy libertarian extremists) oppose age of consent laws, they think children have every right to sex (that's how they couch it), even with adults (in other words the child has a right to be brainwashed and groomed for sex by molesters). I guess these libertarians would "let" 8 years olds drive cars, drink liquor, smoke crack, make porn....
You and I and sane people know that children are not equipped to make these decisions, especially when raised, brainwashed and groomed by such freak parents.