The reason why we have private property and the reason why it is fiercely defended is because private property is scarce. The system we developed is made to reduce conflict in society. People can only acquire property by either creating it from unclaimed resources or trading the ownership from one person to another.
So "intellectual property" does not have these constrains. Once it comes into existence it can be copied to infinity and without any cost to it. What is more the original producer does not lose the property it self. As such it is not a scarce good. It should not be given the same protections as real goods.
The fact that original producer may not be able to get a certain income he desires or to recoup his costs is not a concern of society. He took a risk when producing the property that he may not be able to recoup the costs and he should bear it.