A tax deduction IS a government expenditure.
Your elected representatives set the tax rate and define the budget, which determines what to do with those taxes. Roads. The military. Police. Fire departments, etc, etc, etc.
If I let you pay less than someone else, you need to provide me with a reason why you should pay less than your neighbor. That's a tax break.
Now the government doesn't have the money to do the things it said it would do, because you haven't paid your fair share.
Tax breaks ARE a government expenditure.