I don't understand this comment at all. How do physical property rights exist in the absence of force? How are you yourself not demonstrating that they don't when you talk about thieves stealing your property?
My response would be that violence-enforced monopolies on scarce resources like land and physical objects are more "natural" than those on non-scarce resources like digital media. Note that I don't mean to appeal to nature, because I'm not concluding that one is more "right" than the other. But considering territorial animals practice monopolies on scarce resources enforced by violence, it's clear that government is not a strict requirement for violence-enforced monopolies of scarce resources (unless we propose a very loose definition of "government" that includes the social activity of territorial animals).
