Alien Visits: How and Why?

I would like for folks to explain from their own points of view why the government would keep information about alien life-forms a secret and why no independent source has ever been able to provide some evidence that alien life has visited in recent history.

So far all we have are the various interpretations of the Roswell event, grainy, ambiguous photos, video and film footage, and a number of exposed elaborate, and not so elaborate, hoaxes.

Why do people believe and why should the skeptical be persuaded?



[edit on 04/12/1 by GradyPhilpott]