I don't see how tax credits are always idiotic. Presumably in a given system there is an idea tax rate for a particular income level. If the actual system has t

I don't see how tax credits are always idiotic. Presumably in a given system there is an idea tax rate for a particular income level. If the actual system has the rate 10% to high but the tax credit puts that back where it 'should' be, is that idiotic? In short, don't the final numbers matter more than whether we reach them with or without a tax credit?