The one here is supernatural. There is a religion on this planet called Christianity. It is in their holy scriptures that the war is explained in some detail. Long story short, the forces of Hell, led by Lucifer, are planning to eradicate the human race from existence. The forces of Hell are called demons, they can possess people, even those of us with the Force. But there is an amulet you can wear that will protect you from such an occurrence. So in short, another case of genocide.