The answer really isn't as clear-cut as with physical property. Society / lawmakers recognized that copying someone's creative work or invention doesn't deprive them of anything, and benefits society as a whole. However they also recognized that creators and inventors wouldn't have much incentive to publish if they had no means by which to profit from their work. That's why patents, copyright and the notion of IP exist. Not because it is some natural right, but because there was a need to balance the creators' rights against those of the general public.
Arguably, that balance has gone off. Piracy isn't just people availing themselves of entertainment for free, it is also people consuming entertainment that has not been made available to them in an acceptable manner, for a reasonable price, and in some cases the content wasn't available to them at all at any price, often for arbitrary reasons. Piracy at least sends a strong message to media companies about what people want, and that's not entertainment without having to pay.
I don't know anyone who still bothers to pirate music; there are enough legal alternatives available that are much more convenient. Because of piracy. Similarly e-books: I try to buy these but when a publisher won't sell outside the USA and won't take PayPal so I can fake the address, the it's FU and off to TPB. And it's getting better: buying books right on the e-reader is so much more convenient than pirating them, so who bothers anymore? Series? Still crap. I pirated a bunch of Netflix stuff because it simply wasn't available anymore (remember the "Netflix please take my money campaign?), but I did get a subscription when it became available here. Movies are still bad: poorly available and highly priced, and not available in digital downloads. So I pirate them. And our government backed us up in this, stating that they would not prosecute individual pirates as long as there were no viable legal alternatives available. Sadly they got overruled by the EU (more double secret treaties I wager).
So it's not idiots who feel entitled to other people's creative works for free, it's idiots who feel entitled to lawful protection of an artificial scarcity.