You have some legit things to say about post draumatic effects of brainwashing, sev...
But....
Lets pretend the interplanetary extraterrestrials were the ones who were in contact with these ancient civilisations and gave them this advantage knowledge... Why would ET's come down to this planet thousands of years ago, make humans think they are gods, teach them about the universe and planets and then for no reason disappear, destroy most of the evidence that there ever existed- and then go underground for several thousands of years just to reemerge in the 1940's

?
Why are the nature of the aliens so deceptive if they are here to help us as so many contexts claims? Why do they stelthfuly abduct people in the middle of the night and do painfull tests to them, sometimes having sexual encounters? There seems to be a ritualistic abuse going on and you gotta ask why would something that has 2000IQ do anything that sort... get information

? You would think these aliens being here forever that they would've gotten all the information they need by now.
That's where the brainwashing part comes in... illuminati works in differend levels of networks and illuminati has technology 50-100 years ahead of the public for sure, so it's easy for the illuminati to make people believe "aliens" and "not something else" is doing all these things.