Oh sure, something happened, but it wasn't ET's.Dude c'mon. Clearly something happened.
Can you define what you mean by "fabrication" in this instance?
If the American People were to find out that after World War II, we were flying around in captured Nazi airplanes, like the ME-262, which is nearly identical to what Kenneth Arnold saw, there would have been some explaining to do.
There were no flying saucers at Roswell, nor were there any alien bodies.
It's all a joke.