I didn't downvote you, but I think you need to do some self-directed reading.
The GAO is widely credited from all sides for its standout analysis and data gathering, independent of partisan affiliation or regulatory capture. Its methods are quite rigorous and indeed, if you read the report that I linked in my previous comment, you would see how some of the GAO's investigatory successes have come from comparing agency self-reports against independent audits.
As I said before also, nobody disputes that waste and fraud are bad and should be stopped. But the problem is not nearly as widespread as generally believed - and that is the problem, because it elevates an minor issue to an outsized status at the expense of other, larger issues.