If THSHTF and mass hysteria becomes the supreme social order, there is a good chance mercenaries will arise from the chaos. Anyone from singular individuals to massive corporations will try to prey on people's fears. Then there is the individual or group who will try to help people rather than take from them.
Given the opportunity, would you become the soldier of fortune; the person who wishes to prey off the human race as the creatures they have been employed to destroy? Or will you be the person who wishes to help others survive without expecting anything in return?