Where do unalienable rights come from? Society? If so, rights can be rescinded by society. Ourselves? Same problem. The State? The State can vote to rescind rights.
Eternal rights can only come from an eternal lawgiver, God. And God cannot give us the right to do evil. So no one enjoys an unalienable right to do evil, even if these evils don't immediately affect others.
The State my permit evils for prudential reasons, but not because people enjoy a God-given right to do evil. This is where libertarian thought is so fundamentally confused.
We allow all kinds of activities to go on in "public places." People get up and make speeches, pass out leaflets, hold art exhibits, play musical instruments, etc. Why not allow those nice "sex workers" to ply their trade, hmm? They're not "harming anybody, and "everyone can do whatever they want, as long as they don't hurt anyone." Everyone knows prostitution is a victimless crime, just like gambling or getting drunk, right?
Oh, now you admit that rights are limited by the rights of other people?
Then the right of a woman to "choose" abortion is null because she is depriving another human being of the paramount right, the right to life.
Game, set, match. Thanks for showing how flawed the "pro-choice" position is.
As for historic precedents, try the Soviet Union. Abortion was a "right," and officially encouraged. That's about the only right anyone had over there.
Then there's modern Europe, which is following the logical progression from abortion/infanticide, to euthanasia of the old, to assisted suicide for the mentally ill, etc.