The copyright monopoly is not a property right. It is a limitation of property rights. Copyright is a government-sanctioned private monopoly that limits what people may do with things they have legitimately bought.
Defending the copyright monopoly with the justification that property rights are sacred is quite like defending the death penalty for murder with the justification that life is sacred. There may be other, valid, justifications for defending the copyright monopoly and these limitations of property rights — but that particular chain of logic just doesn’t hold.