WROL, Without Rule Of Law. Something that would happen in times of emergency and catastrophe. What if it was a situation like when the world had the Spanish Flu Pandemic in 1918 where between 50-100 million people died and that was the days before mass transportation? If you used the lower number of 50 million then that was still 3% of the population.
If you want to have a reason that shows you should stock up on water, food guns and ammo then go check out the flick Contagion. If that doesn't make you think then nothing will.