If no one owns anything, if there is no property, there can be no theft either.
Your inspiration comes from J.J. Rousseau, yes? Partial quote: "The first man who, after enclosing a plot of land, saw fit to say: "This is mine," and found people who were simple enough to believe him, was the true founder of civil society. How many crimes, wars, murders, sufferings and horrors mankind would have been spared if someone had torn up the stakes or filled up the moat and cried to his fellows: "Don't listen to this impostor; you are lost if you forget that the earth belongs to no one, and that its fruits are for all!" But there is much evidence to indicate that, by that time, things had already reached the point of being unable to go on as they had: for this idea of property, which depended upon many preceding ideas that could only make their appearance one after another, did not take shape in the human mind all of a sudden. There had to be many advances; people had to acquire a great deal of knowledge and technique, and transmit and augment it all from one era to the next, before this last point in the state of nature could be arrived at. . . . "