Here's the scenario:
You wake up, you realize your electricity is out. You think to yourself: Did I forget the bill? You go outside and you notice everyone elses electricity is out, you grab your cell to call a friend... but your cell is dead. So you go to get into your car and visit them. But the engine doesn't start because most modern vehicles have computers built in that operate major functions of the vehicle.
This is the result of an Electromagnetic Pulse or EMP. It was launched by one of your countries enemy's and all electronic devices have been destroyed. You have no electricity, you have no running water, no means of modern communication, you cannot pull money out of your bank account because the computers that transfer funds are dead. There is no emergency broadcast. There is no guidance or supervision. There are no cameras to record crimes.
Soon people will start acting out, looting will begin. The police cannot properly control the populace or patrol the roads because their equipment including their squad cars are also down. The food in your fridge is spoiling, no one is going to work at the stores or the fast food places.
What would you do?