"If you wish to make an apple pie from scratch, you must first invent the universe."
You are not born in isolation from the rest of us. Everything you create originated from an idea that you learned from somebody else. You have no right of ownership over something that is not entirely yours.
So if you make an apple pie, you don't mind that I come and steal it from your windowsill? You don't own it, after all.
What if you spend a year making a beautiful cabinet? You didn't invent the tree, or the saw, so it's okay if I come by and cart the cabinet over to my house, right?
> That's an argument against the entire idea of personal property.
It doesn't seem to be inherently an argument against the entire idea of "personal property", it seems to be inherently an argument against the idea that property (personal, real, or otherwise) is a matter of absolute right, rather than a matter of an exchange in which owners are granted privilege at the expense of restrictions on everyone else's freedom because of a perceived social benefit to that exchange -- where the parameters, then, of the particular privileges of owners become subject to analysis of whether the exchange really does have net social value.
In regards to intellectual property of the types dependent, in US law, on the Constitution's so-called "Copyright Clause", this is pretty explicitly the premise in the US Constitutional system; in addition, the differences in the privileges and limitations of real and personal property rights (and the particular parameters of particular subclasses of each), as well as things like eminent domain, are very hard to conceptualize under a model of property-as-absolute-right unless you simply define each feature as its own axiom of property rights, except the ones you don't like and define them as violations of axiomatic rights, whereas the whole regime of property rights and its evolution makes a lot more sense under a social benefit exchange view with an evolving view of what provisions actually provide social benefit.
You are not born in isolation from the rest of us. Everything you create originated from an idea that you learned from somebody else. You have no right of ownership over something that is not entirely yours.