If your Soviet neighbor is trying to set fire to your house, you can't be worrying about the Arab down the block. If suddenly it's the Arab in your backyard, you can't be worrying about the People's Republic of China and if one day the ChiComs show up at your front door with an eviction notice in one hand and a Molotov cocktail in the other, then the last thing you're going do is look over his shoulder for a walking corpse.
World War Z: An Oral History of the Zombie War (ed. Broadway Books, 2006) - ISBN: 9780307351937