Half the job of solving social problems is getting the word out. This is especially true when it comes to criminal activities like fraud. Victims of fraud are by definition people who don't know enough about fraud to realize when they're being ripped off.
That's why yamikinyu (loan sharks) are said to prey on the "weak," a euphemistic adjective used to describe people who are poorly educated or, at least, badly informed. Anyone who reads the newspapers understands that those advertisements for easy loans plastered on utility poles and the insides of phone booths are for companies that work outside the law. They know those companies will bleed you dry as soon as you walk through the door.
The problem is that many people don't read the newspapers, and while they know instinctively that the term "easy loan" is an oxymoron, their desire for instant cash can outstrip their common sense. So, how do you get through to them?