According to Richard Epstein:
As such, the [charitable deduction] device has three important advantages. First, this non-discretionary subsidy increases the total amount of charitable activity, without increasing the role of the government in the collection or distribution of funds. Second, it still requires charitable institutions to persuade some potential donors that their mission is worthy of private support, which can only be done if organizations have some form of private monitoring by charitable boards and other external watchdogs. Third, the rise of charitable organizations attracts the civil participation of a large number of people who receive no direct cash payment for their charitable efforts. Charities, in sum, reduce the control of government over the lives of ordinary individuals. People in need now have other places to look for assistance.