I just used charity as an example; the same argument applies to taxes as well. The only difference is that taxes are enforced. It's still a priority to ensure that taxes are given and used correctly. In many countries with welfare, for instance, to stay on welfare you are required to prove that you have been looking for a source of independent income. Now, scandals do happen, and they happen often, and I agree with you that it's an important priority to make sure that welfare is only used in a positive way. I would even support a limit on having children unless someone can prove they have the financial means to take care of them. This seems both humane and efficient.