The Truth Probably Isn't Out There

Dave Weigel has a funny post on five conspiracies and the Americans who believe them.

Two of the numbers involve UFOs and aliens, presumably extraterrestrial. (Only the AP refuses to acknowledge the existence of the earthly kind.) But here's my question:

Over the past half dozen years, video-capable phones have found their way into the pockets of - what? a couple of billion people? How is it that none of them have captured any credible UFO footage? (i.e. this:)