Actually it does. Legitimate property is the stuff that we have the information necessary to control without hurting others. Animals are not able to manage much but their own bodies and nests and stuff. Humans can manage far more. We have the ability to reason at a much more advanced level. We need these things to survive, and we have the ability to use them and to do so without hurting others for it. We have dominion over other life forms generally speaking, because we are, well, just able to. We're designed that way. We are tapped into logic, the logos of this universe, and are therefore endowed with the ability to be stewards of it.