Earlier quoted context omitted.
There is some fraud and abuse, of course. And the huge numbers involved mean that even a small percentage of fraud is a huge number. But there never seems to be any statistics that back up the assertion that government (in general) or the US government (in particular) produces outrageous amount of fraud or abuse.
But there never seems to be any statistics Ever heard of the Pentagon? Here's a good start: https://www.thenation.com/article/archive/pentagon-audit-bud...
I will say that looking up the results of the more recent audits (2020), the summaries frequently talking about failing audits but also of uncovering zero evidence of fraud.