Very interesting... Check out the photos he left. Looks really convincing, especially the documents of his time travel machine EDIT: Oops. http://johntitor.strategicbrains.com
I believe very much in time travel. But if we heed his advice, then that means his prediction won't come true. Then in the end, we will still think he's a fake.
Hmm... For a soldier on a mission, John certainly had a lot of time to spend on the Internet... Oh well, let's just see if his "predictions" come true.