Who? The Libertarians?
There actually are libertarians who would allow that a marriage contract can contain stiff penalties for sexual infidelity, and that a right to life should be as fundamental as a right to property.
The comparison, first of all, of the Right to Life to the Right to Property, and saying both are equally fundamental, is flawed. How can one own property if one has no life? At the moment of death the process of distributing the deceased's property begins. Conversely, one can live without owning property. A baby in his or her mother's womb owns nothing, and yet lives just as certainly as you or I. The only way the argument works is if you consider your living body your property, which the Libertarians do in the case of women but not unborn children.
Perhaps there are those within the party who recognize the right of unborn children to their life, but that is not the Libertarian Party Platform. If you proudly wear the label "Libertarian" after your name you are advocating their entire platform. On the subject of the Right to Life the Libertarian Party Platform differs NOT ONE IOTA from that of the Liberal Democrats/Socialists.
Yeah, I know. Yea for them. But the majority support all kinds of crazy social reforms.
According to this piece, most libertarians are pro-abortion, pro-gay rights, and so on. I didn't take time to check the specs on this piece, but I feel it's in line with what most consider the stereotypical libertarian--for the most part economically conservative and socially liberal. I'm of the impression that libertarians try to look like conservatives because, in America, conservativism is more mainstream right now than any other political ideal. Libertarians look plain crazy to me. A faction of anarchists even exist in the party.