I too grieve for Palestinians (and Sudanese, and Haitians, and so on), but land is a complicated thing. You can't build much of a life in a modern society if you're constantly itinerant, if you have no place to call your own. So we do indeed need property rights; and furthermore, since we do things collectively, we need some sort of larger-scale stability of conditions as provided by a nation-state (though the nation-state itself seems probably dispensable).

Unfortunately, this greatly complicates things, as people can have disagreements about who gets which property, and how collective action is organized (by whom, where, etc.).