I believe every once in a while people see those things and get worried and then see that nothing happened. And then a new group of people sees the next "prophecies" and then get all worried, yet nothing happens. And then...
You get the idea.
I was searching the internet one day and I found some links to Alex Collier's interviews in the 90s. The guy said Japan would sink in the ocean, the Hale-Bop comet had a reptilian spaceship in its tail, etc...
We are just the new generation of truthseekers. We will create resitance to prophecies and then a new generation will come by and everything will start again.
Think of this as a vaccine (without microchips or sterilizing substances of course
).