Govt Excess - or Private Sector Corruption

Here's an interesting thought, though:

I've been listening to people harp about the Dept of Justice wasting taxpayers money for paying $16 per muffin and $8 per cup of coffee. Certainly, a foolish oversight.

But where is the press criticism and coverage of the private contractors who charged this? What about the military contractors who literally cheated the taxpayers out of $400 for an ashtray?

Certainly, a failure of govt oversight. But why is no one calling out the corrupt companies who are literally the ones screwing the taxpayers?