Uh-oh..... looks like a setup to me.
Pretty soon the spaceships will start arriving and the earthlings will be told that "they" are the geniuses behind these ancient observatories. It won't be too hard then for them to convince the world that "they" are also responsible for sending the millions of missing earthlings to be "reprogrammed". What the deceived world won't realize is that these "benevolent" aliens are in reality demonic beings who are working for the AC.