God's war of Armageddon will actually prevent the destruction of all mankind.:) Jehovah created the earth to be inhabited, not destroyed in a thermonuclear war among humans or otherwise rendered unfit for life.
Nndwa ya Mudzimu ya Haramagedo a si ya u tshinyadza ḽifhasi, fhedzi ndi ya u ḽi tsireledza kha vhathu vhane vha ḽi tshinya. - Nzumbululo 11:18.