People who make charitable contributions reduce the amount if income that is subject to tax - these contributions do not reduce the amount of taxes owed dollar for dollar.

If you are in a 25% income bracket and choose to give $1,000 to the charity of your choice, you reduce your taxable income by $1,000. However, you reduce your tax obligation by only $250. You are out a net $750. In effect, you give away $750 and obligate the rest of us for the $250 deficit. If you choose to give to the charity of your choice, that should be your business and your business alone. The government should not kick in.