The old classic liberals were infected with anti-propertarianism by William Godwin who originated the idea that private ownership of property was the cause of all the world’s evils. He saw nations going to war for land. Men fighting over wealth, etc.
The leftist socialists since then have never been able to escape the influence of that idea, and have focused on spiritual concepts of equality to the exclusion of justice via property. They thus feel free to trample on property rights in the name of egalitarianism, and willingly use coercion to achieve that outcome.
I went out with a girl recently, a leftist, and she asked me about being a libertarian. What I told her was that like her, we libertarians too believe in freedom of speech and the like. But we think that rights can only achieved if you have corresponding property rights. Thus, the right to freedom of speech is actually a property right; meaning that you have freedom of speech only if you have the right to publish a book, or to rent a lecture hall and invite people.
And you have freedom of religion only if you have the right to build a church or the like. What use would it be to a jew to have freedom of religion if the government owned everything and did not allow the jew to make matzah balls? Freedom or speech or religion is a farce if you don’t have the corresponding right to actualize that right in the real world.
It’s taken me a long time to understand the leftist mindset–leftists treat human being and rights as floating abstractions, almost spiritual concepts, and ignore the physical reality that’s entwined with it. They’re deep into the idea of using power and coercion to right wrongs, and see no contradiction there, and they believe in the impossible egalitarian goal of ‘equality of outcome’ which can never be achieved, as opposed to the just concept of equality of opportunity, of equality before the law.
The leftist libertarians tend, therefore, to be so-called ‘civil libertarians’, meaning they want right and equality but they divorce that concept from economic libertarianism. They want free love, drug legalization, gay marriage, etc., and we agree with them on that, but they don’t extend that concept of freedom to your right to do what you want with your property.
It would be interesting to try to craft an argument along those lines tho.