Gorgie, you asked one of the most convoluted questions there is...let me have some time. I'll try and put some thoughts together...it won't be facts per se, just what I have gathered...

Btw...'They' includes off world intelligence as well...just depends how much you are willing to open your mind, as to what your awareness will allow you to accept into your worldview. It is as complicated as anyrhing in the human condition...and everything is compartmentalized...so no one KNOWS all of it.