"From nuclear missiles to fighter planes, software code to spy satellites, the Patriot missile to Star Wars, Lockheed has come to dominate the weapons market in a way that the Standard Oil Company used to hold sway over the nation's petroleum supplies. And it all happened with the help of the federal government, which steered lucrative no bid contracts Lockheed's way, enacted tax breaks that encouraged Lockheed's merger and acquisition frenzy in the 1980s and 1990s and turned a blind eye to the company's criminal rap sheet, ripe with indiscretions ranging from bribery to contract fraud."
Sounds like the US government has a vested interest in Lockheed's success to me. This is a company that has a track record of alleged bribery going all the way back to the 'sale of the century' fighter contest in the late 1950s at least, which ended with the deaths of hundreds of European pilots killed in accidents in the F-104 Starfighter.
As for the Boeing case, prosecution occurred because of a breach of protocol (the rules of the game) that was so flagrant that the authorities were forced to act. Well, that and the waste of hundreds of billions of taxpayer dollars and the protests of Northrop Grumman, another part of the military-industrial establishment.
As I said above, what's good for the goose is good for the gander. US laws exist to protect US self interest.