If we can agree that tax trillions are and have been squandered, then we can probably agree that some fraction of this waste is stupidity and incompetence, and another fraction of waste is venal, clever design to appropriate money for special interests.
I think 90% of the waste is by design, but whatever ratio may be, we should hold agencies accountable for the resources they squander, and the primary method to do that is to deprive them of funding proportionally to their waste and incompetence.