Why do people leak documents? Because they think other people's secrets should be public information.
Why do we create ownership rights over information, such as patents and copyright, in the first place? To incentivise people to make more of those things. Why are these rights time-limited? Because nobody can, with a straight face, continue to claim they need any greater incentives than they already have.
Why go governments have Eminent Domain? Because the best interest of the people (or the nation) isn't the same as the best interest of the existing owners.
Why did the October Revolution and the Cuban Revolution happen? Because enough of the right people in the right place at the right time, decided that the old system of combined ruling-and-owning was bad.