In order to have total job security in IT...

I need to be a hero,
in order to be a hero,
I need to save the day,
in order to save the day,
I need to engineer a crisis,
in order to engineer a crisis,
I must be the only person that can fix x, where x is some critical process the breaking of which, jeopardizes the business.

And there you have the basis of the most common personal work philosophy of the greatest job creation scheme since the pyramids were built.