A father, let's call him Steve, needs money to feed his children. He won't ask for help, because he believes no one would help him anyway. He won't go earn money because he needs the money today. He only wants to get money for food. That is a noble cause, right? He goes to sit in the park to think about his problems. As Steve sits there thinking, a person we'll call Ernie walks past, stuffing his wallet back into his pocket, an ATM receipt in his hand. Steve gets an idea. He walks up behind the stranger and taps him on the shoulder.
Steve: "Excuse me sir."
Ernie: "Yes?"
S: "You must give me some of your money"
E: "I don't think so"
S: "Yes, you are required to. I wrote a essay about it", he lies. "Besides, I am not asking for ALL of your money."
E: "Go get a job, you bum". He turns to leave.
S: "If you don't give me some of your money, my friends out there behind the bushes will shoot you. Then we will look through your wallet and find out where you live and go to your house to get the rest of what you owe us."
E (looking nervously around): "Um. Okay. Here". Hands over some money.
S: "Thank you for voluntarily complying. See you tomorrow"
Steve the father, emboldened by his success, goes up to stranger after stranger and starts the same routine, this time adding "Of course I have the authority to do this. I don't need to show you the whole essay I wrote, or explain it to you. You wouldn't accept it anyway. I can prove I have the authority to do this because I have a history of success when confronted about my actions. Pay or I will be forced to make an example of you so that fewer will resist me. If you try to avoid paying by hiding money in your shoe or by burying it somewhere I will destroy you so completely that no one will dare question my methods again."
Steve becomes a wealthy man. Few dare to stand up to him, because, true to his word in this regard, anyone who resists is destroyed as an example to the rest of us.