The CIA has been quelling UFO hysteria by having Hollywood relentlessly pumping out UFO hysteria.
I have heard good arguments for both the above.
Actually, the government's suppression of the topic of UFOs (by debunking ALL sightings) would increase public curiosity and appetite for movies on the subject. This is similar to how a lack of government comment on the recovery of the current "objects" shot down results in the growth of conspiracy theories.
The 'TR3B Manta' comes to mind.
