My cynical opinion: We, H. Sapiens, are the only complex, sapient, tool making/using species in the visible Universe i.e.: a 13.7 bly radius from Earth. There are no LGM's for a space version of "The O.K. Corral" shootout. We wage war, (organized violence in varying degrees), mainly against our selves; it's in our genes. Are we smart enough to preclude a war over Space, (i.e.: overhead, the Moon, Mars)? Don't bet on it.