If you guys are dead set on believing in conspiracy theories..
Consider how much the military industrial complex wants you to believe in mysterious dangers in our skies, or extra-terrestrials. Consider that congress people from states with heavy aerospace spending have often sponsored bills to research UFO's and the like (like Harry Reid from Nevada, where just about every aerospace company has some operations, as well as their own home grown companies.)
Now imagine why the military industrial complex might want the public believing they are in danger, or that we can find aliens if only we... spent more and more money on research and development.