Well, if you want a strictly utilitarian argument
No, I don’t want one. I want an argument based on morality.
There are utilitarian arguments in favor of copyright. The first answer to them is: even if the copyright increased overal utility, it wouldn’t matter, since we are worried about morality, not about utility. So, I want to use a non-utilitarian moral justification of property rights and then explain why it doesn’t apply to non-scarce resources.
I don’t know who the owner of an improved property could be if not the person or people who developed it from its unimproved natural state into the dwelling, crop, or what have you that exists now.
The society could own the property. It could appoint some central planners that would oversee the property development. It would suck economically, yes (because of the calculation problem, etc.), but why would such a turn of events be immoral?
If you’re the homesteader, it is your prerogative to control the property and assert your right to use it unimpeded by someone else with no claim to the property. If I homesteaded the property and someone walked inside one day and throws me out the door, you can bet I’m going to assert my rightful ownership and undertake whatever means to remove the aggressor.
I don’t see a moral justification for property rights here. Why is it my prerogative to control the property if I am the homesteader? And how come this reason applies only to scarce resources?
I know you’d want to re-assert your control over the property that you have homesteaded, but what would be the moral justification for your doing so?
Heck, if you lock the door when you leave your house you are doing so to restrict unauthorized entry, so it doesn’t really seem like a moral dilemma. Or maybe I misunderstand you?
For sure I would, but why would it be moral for me to do so and to restrict other people’s access to my property? Maybe I am using a utilitarian argument, as opposed to a natural-rights argument? Maybe I am using a religious argument?