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Im not a "weve been visited" believer, but this logic is flawed in that you cant really document which came first - the descriptions of the encounters, or the movie scripts.
No, actually, you really can. Pretty easily. You can track the transition from the human like "Nordics" being the most commonly reported type to the short Grays and match them pretty perfectly to Hollywood.
The first UFO "flap" was in 1947, but at the time, it was assumed they were Soviet aircraft. aliens didn't become a working theory until Ray Palmer started publishing Sci-Fi stories about them in Fate in 1948.
The Day the Earth Stood Still came out in 1951. In 1952, you had George Adamski and the other "Contactee" scammers claiming to meet people from Venus who were similar Nordic types evangelizing peace and how nuclear bombs were going to kill us all. Just like Klaatu did in the movie. but by the 1957 Flap, the Nordics were just losing their popularity.
Now, some have claimed that Betty and Barney Hill saw Gray Aliens and were the beginning of the "Abductee" phenomenon in 1961. A few problems with that. First, while the crude drawing they did really did look like Grays, their descriptions of the aliens claimed they had "Jimmy Durante Noses" and wispy black hair.
But when they made the TV Movie "
The UFO Incident" in 1975, the producers created the classic "Gray" look, which oddly all "abductees" have kind of stuck to. A few weeks later, you had the Travis Walton abduction, and the first description of a gray. (Walton also said he saw hippy like Nordics on the same spaceship, but never mind.)
Another key point. while all the abductees are pretty consistent on what the head of a Gray looks like, they get pretty varied on other details, like what the Grays wear (Uniforms, Shiny Space Suits, Robes with hoods, buck naked) or what their hands are like (Four fingers, six, feathers, suckers)