Oh come now. Millions of amateur astronomers look up at the sky every night and millions more listen to radio signals from space, yet no concrete evidence has ever been produced. Do you really believe evidence of ET could be so easily covered up? They can hardly airbrush the sky itself.If ET's do exist any really evidence will be subject to a cover up.
Furthermore, I'm terribly confused as to why some of the people in this thread would think intelligent life would cause panic and society meltdown. That's just plain stupid.