It does add up if you understand technology and history. The issue is that you're approaching what you see as a problem the same way religious types do: "I personally don't understand the whole situation, so rather than get educated, I'm leaping to an easy conclusion without evidence."
I also assure you, none of your ideas are new. Chariot of the Gods? was published in the 70s, and Graham Hancock published his works in the 90s.