Film set in USA where everyone wears a headset which controls thoughts by suppressing IQ. Everything is a copy of 1950s, even cars & clothes. Hero discovers the truth and is told by interrogator that the 1950s was used to pattern the country because that was when it was happiest.
At ending he has become a TV presenter; on live TV he tells everyone to remove their headsets, then shoots himself, to shock people from their stupor enough to take off the headsets.
Think the film starred a quite young Terence Knox. In UK, the film title was the protagonist's name.