Since the kiranawallas and the vegetable retail shopowners do not pay taxes why we should support them?

The kiranawallas and the roadside vegetable and eatable vendors do not pay taxes which is a big revenue leakage for the govt. The big retail chains will give employment, pay taxes to the govt. and also make the shopping a pleasant experience. Why the political parties are supporting these tax evading kiranawallas? Whether the common people should support such political parties?