I think the US government actively encouraged the UFO craze, because it drew attention away from the experimental aircraft they were testing, like the SR-71 blackbird.
Someone at Pentagon was recently investigating UFO conspiracies and found that several kept looping back to them. And they realized that at least one was directly planted by themselves during the cold war to confuse the USSR about what weapons were real or not.
That honestly wouldn't surprise me tbh. And area 51 being great conditions for testing aircraft: empty space, clear skies, easier to recover parts and people from than the ocean, very little human habitation.