I don't agree.No land belongs to anyman unless your willing to fight, die and kill to protect it and keep it. Otherwise some other man is going to take it. This is a known.
If allowed to, humans can be very bad indeed, and to curb some of those negative attitudes we have laws, infrastructure, and processes to ensure that the world is not just a carnivorous greed fest. This organsistion, in concert with those humans who are not motivated by greed, allows us to create a human society in which people prosper, and grow, and make connections, and learn, and co-operate and teach, and become aware.
Otherwise, we are worse than animals, that at least do not kill for pleasure or profit. Otherwise, there is no such thing as justice. Not revenge, but justice, reconciliation, and if necessary, arbitration.
Might is not right, it is just might.