All human rights are "figments of our collective imagination". Should we abolish them too?
We would not have culture or have achieved the level of society that we have if 'intellectual property' were the normal mode and could be deduced from first principles.
Copyright and patents are supposed to foster creation and innovation but it seems they are hindering rather than helping our development in these areas.
Well. Some of these follow when you accept certain axioms and work from there. Not everyone accepts those axioms (at at least the same ones), if the vast variance in "human rights" across the globe is any indication.
Now of course it can be argued that only a few countries in the "civilized western world" understand logic and can come up with the proper first principles. (People have told me that)
In a good system you don't care on which side of the ledger you're on, which is something that that same logic would allow you to deduce.