And you presume that you know the friendliness status of every other survivor. Such assumptions only hold within your limited circle of acquaintances. What happ

And you presume that you know the friendliness status of every other survivor. Such assumptions only hold within your limited circle of acquaintances. What happens when you encounter someone who you and your circle of friends and neighbors don't know? The social order is gone. There's a "disaster", and then there's the total collapse of society.