Why I'm not a classical liberal

Why am I a left-libertarian? This question breaks into two parts: why, given that I'm a libertarian, am I on the left? And why, given that I'm on the left, am I a libertarian? First things first. Here are six reasons. I'll be brief; these are intended to be first words in a dialogue, not last words.

1. A missing theory of property duties. I say "duties" rather than "rights", as right libertarians or classical liberals do, for a simple reason. To justify inequalities of property, you must demonstrate that the poor have a duty to respect the rich's property. How can this be done? [...]

The problem is, this only justifies a fraction of property ownership. Arab princes are wealthy not because they've discovered new uses for oil, but because they are lucky enough to own land under which there are oil deposits.

And in many cases the history of land ownership is the history of theft, conquest and expropriation. How can we justify property ownership based upon this? [...]

3. Self-ownership doesn't justify inequalities. A cornerstone of Nozick's libertarianism is the principle that we own ourselves, so that any effort to tell us what to do is a form of slavery.
This principle, though, doesn't justify inequalities of income, because incomes are jointly produced by individual talents and social circumstances. Thierry Henry's skills as a footballer, Bill Gates' as a software developer or Paul McCartney's as a songwriter would have earned them little 100 years ago. Even if they own their talents, they've no right to the social conditions in which these talents can thrive. [...]

An interesting platform, don't you think?