Ok, so you're hanging your hat on Roswell and Kenneth Arnold, is that correct, or no, not Roswell but just 1947 sightings (which ones exactly lead you to this) And then following this an alien refugee narrative unfolds where we are reverse engineering their craft made of balsa wood, bits of metallic sheets and some colorful tape, or wait, not Roswell? Which craft is it?
And then meanwhile, all the othe countless UFO sightings since then, and I'm not talking sentient sky critter balls of light (obviously I jest here, but after many decades of research and guess work, even Constable almost makes reasonable sense in attempting to explain one aspect of the conundrum), but the countless of observations of metallic craft, craft with the seamless texture of glass, crafts that move through objects, that dissolve, that appear to fly off into space, that appear to dock and merge with other ships, that fly in formation, that have hatch ways, portholes and strange humanoids that walk out of them, that follow planes, that come in thousands of shapes and sizes and so the list goes on....all that stuff, that we should not call UFO's alongside the balls of light, strange amorphous objects, small probes, giant mother ships, triangular shaped objects, spiky balls, round shaped eggs etc. etc. that stuff is just people seeing things?
Listening to the show & reading the forum, alongside the many other avenues people get their UFO lore & science from, tells us that their are many, many unidentified phenomenon flying around in our skies, entering and exiting water, suddenly appearing and disappearing, showing up on radar, scaring pilots... Who is grouping it all into one thing? There are obviously many things at work.
I'm glad for you that you've found a 1947 piece of mind because most people have gone on a long strange journey when it comes to trying to understand the phenomenon, trying to separate ETH from the many other H's and be they Hynek or Vallée, these paradigm shifts are the result of prolonged study of the phenomena. So you're lucky that you've found a singular answer to believe in because a lot of us can't reconcile the situation so quickly, nor do we all believe in Roswell as an alien crash event, or that 1947 can tell us anything specific outside of a sociological effect on the populous, hence the space of middle ground, still asking questions, is where I reside.
I can also now be found over at Sesame Street.