That doesn't scale. Humanity's ability to find natural resources dwarfs the amount of natural resources to be found on earth. It's not hard to 'find' arable land, for example. Any counterclaims would have to be defended in base of some agreeable concept of justice, or failing that, via violence, actual or anticipated. Violence over resources can happen, and happens, irrespective of ideological differences.

Much of your money is held in custody in some bank, where you put it because you trust they'll give it back to you when you ask for it, not because you think you can strongarm the clerks into returning it to you.

Maybe your car is parked out on the street. Even if you have it in a garage of your own, if some burglars came you may find it more reasonable to let your insurance company or the police take care of it rather than risk your life trying to stop it yourself via violence.

Those mechanisms work because there are rules in place about what is reasonable use of resources and wealth, and those rules could not be stable or widely respected if you couldn't defend they're just in some way.

Like all the land we took from the Indians?