A few years ago, a plumber was at my house to fix my kitchen sink. At some point he said, "I see from the books you are interested in space. You know integrated circuits and photonic networks all come from that spacecraft they found at Roswell".
Pffft...
Intelligence is multifacited, but so must be stupidity. Thinking that technology comes from aliens is a pretty good indication of utter and profound ignorance about technology, history and people.
Also a profound inability to weigh different probabilities against each other. People who go on about UFO conspiracies reject one piece of evidence after another, with total scepticism. Then they turn around and believe something fantastically improbably and will hear nothing against it.
A good example is that the project at Roswell has long since been declassified, spy balloons designed to fly over the Soviet Union. It was project Skyhook or maybe Genetrix, not sure. The files aren't even secret anymore, but nobody cares, they don't even want to hear about it.