And few people really need funds if all of us stop then those needy people will face a lot of problems that's the main reason for lending.
Maybe I'm old-fashioned, but in most cases I don't think you help people who have money problems by lending and making them pay interest. They're only digging a deeper hole, instead of saving up once and being ahead for the rest of their life.
From what sashan says, I see that he does it partly out of altruism, but many times to get out of the hole as you say is as easy as tightening the belt for a while, which will be more or less long depending on the size of the hole. But the thing is that when I see people asking for a small loan, and after paying it back they ask for another one, and another one, I tend to think that things are going to end badly. It is not necessarily so in 100% of the cases but it indicates a bad management of own resources and not knowing or ignoring basic rules of personal finance.