A number of public and private entities use the field. H211 (and others) typically do two things:
1. They pay fees to NASA for the storage and operation of their aircraft at this airfield.
2. They agree to allow NASA to install equipment in these aircraft and afford NASA the use of these aircraft for experiments.
In exchange for this, they get cheap fuel, but not below NASA's cost. Sure, they're not paying the normal taxes on this fuel because federal regulations prohibit the taxation of fuel sold from government owned airfields, and federal regulations allow for private operations to use NASA facilities under contract with NASA.
NASA has hangars, fuel storage/delivery facilities, a short supply of aircraft for research, and no money. Private entities have aircraft, no place to park them near their bases of operation, and money.
Would it piss you off if frequent government contractor Lockheed Martin operated private aircraft out of Moffett? Oh! Wait! They do! Would you be pissed if the highly publicized and technologically interesting solar plane venture Solar Impulse parked their plane in one of the hangars and threw parties around it while in the Bay Area? Oh! Wait! They did!
People need to chill out about this. This is no big deal. Either change the laws creating this condition or kick private entities out of Moffett, an idiotic action that would likely result in the financial collapse of an already under-funded operation of NASA.
But, yes, I'm willing to grant your first statement... you are simple minded.