Copyright statutes benefit society by providing incentive to produce original works, so some kind of copyright statute is ultimately justified. But these statutes also represent a significant cost to society because they create protected monopolies. In many countries, copyright statutes grant copyright protection for the life of the author plus several decades. This is too long, since the societal benefit from the additional years of copyright is more than offset by the societal cost.
A statute should not limit rights unless it can be shown that it thereby enhances other rights is a principle that, if valid, most strongly supports the reasoning in the argument.