Why is Charles Dickens a supporter of poor?

The Poor Laws were England's response to poverty. However, the Poor Laws barely kept the poor alive while trampling their dignity; arduous labor in workhouses or humiliating stays in debtors' prisons (both of which Scrooge references in Stave One) were the two welfare options for the poor. Even worse, poverty was profoudnly cyclical. Poor children, afflicted by rickets from working long hours in polluted factories, had little chance to survive into healthy, let alone wealthy, adults.

Dickens's family was sent to debtor's prison when he was twelve (he was able to work in a shoe-polish factory), and the experience clearly marked his later work. In A Christmas Carol, he lashes out against the greed and corruption of the Victorian rich, symbolized by Scrooge prior to his redemption, and celebrates the selflessness and virtue of the poor, represented by the Cratchit family. He even examines the seamier underbelly of London, showing us a scene in the bowels of London as workers divvy up Scrooge's plundered possessions.