>Well if you won't take a confession as hard evidence, what would to accept? Actually seeing the person's face out the airplace window before he slammed into the tower?

In this case your video store on the corner is vault full of hard evidences
about existence of aliens, monsters, vampires, 100m snakes etc.
That is of course if you choose to believe in it.

If you ask me, Superman is more convincing then those tapes.
At least it is an 'A' production.