Oh come on. Nobody said it never happens, but do you have any reason to suspect Maher Dussel is corrupt or incompetent? Do you have any reason to believe this random guy is as qualified as a team of CPAs to audit public sector books?
He's probably not more qualified, but independent oversight of public expenditures serves a valuable purpose. A hired accountant has no incentive to point out that it might be wasteful or unnecessary to spend Y money on a thing X as long as everything is done by the book.