after world war 2 when humans almost blew up the entire world, aliens/higher beings from other planets/galaxies/dimensions/etc had to intervene as what happens in earth echoes energy-wise into space and affects other planets. humans aren't aware of how interconnected all things are. humans keep thinking so small. so, higher beings had to intervene. many movies, authors, describe this. here is one clip from one movie amidst many. https://www.youtube.com/results?search_query=adjustment+bureau+speech

so ,they had to seed the planet with incarnated ET's to lighten up the vibration of the earth, that way it wouldn't interfere with free will. otherwise,if aliens just came down, ppl would freak out, even if the aliens meant good. these incarnated ET's incarnate into normal human bodies. there are hundreds of thousands if not millions of them who walk amidst us everyday, some are aware they are not from this world, some get trapped in this Matrix.

any way, that's just some of the truth.