You don't like the numbers that have been published but have no facts to support what you would rather believe so you attack the reputation of the source of the numbers as your fallback. Have you considered pursuing a career as a lawyer or politician? You would fit right in.
My point is that you have no facts either, just the rantings of one of the most corrupt politicians in the House (which is ironic, given that we are talking about corruption...) You did not provide any sources for Mr. Issa's claim - and neither did the Post article you cited. In fact, the same article provided another (unsourced) number that was less than half what Mr. Issa claims.
Moreover, the article you linked was not written by the Post itself, but by some "senior principal analyst" at a company that specialises in government contracting! Do you think that maybe claiming that their competitors are missing billions of dollars in "waste, fraud and abuse" might just be a marketing ploy?