Some conspiracy theorists claim that governments are hiding evidence of contact with aliens. Why might governments want to hide this information?
Governments may desire to conceal proof of contact with extraterrestrial life for a variety of reasons. Among them are the following:
Governments may be concerned about national security because they believe that if the existence of aliens is made public, it may spark fear or unrest or give other nations a leg up in the arms or technology race.
Governments may be worried that the disclosure of alien contact may result in job losses or a downturn in the economy.
Governments might be afraid that the reveal of alien contact might put people's religious convictions in question or cause societal upheaval.