You don't know that about "most people". Most people will deliberately pirate content given the chance.

I personally would say it's the bad side of justice - there is no downside to giving away that which is unlimited. It's mostly greed, but greed has utilitarian roots also, because encouraging piracy will discourage innovation.

It's a sad situation really: that the best solution we must adhere to is denying free resources to the masses. Not really human.