What’s the psychology behind the “need” for doomsday prophesies that some people have?

What’s the psychology behind the “need” for doomsday prophesies that some people have?
What is it that makes people turn to doomsday prophesies and end-of-the-world claims and believe in them?

I’m asking this again since there seems to be a need to pint out that:

This is the psychology section. I don’t ask for your personal beliefs or list of prophesies, I ask about the PSYCHOLOGY behind the human “need” for such things.

Answer by Kat
This gives some people an excuse to do things they would not otherwise do. For some it is spending their life savings, finding a religion, sleeping with many people, others just need a cause of some sort to charge up their lives and give them focus. Nothing in your life seems quite so bad if you think the world is ending.

What do you think? Answer below!