Why do we love conspiracy theories?  New Scientist Magazine weighs in.

In short, we want the world to make sense, so ideological cabals and aliens offer a more attractive solution to the appearance of randomness than does randomness itself.  On the one hand, we have to temper our impulse to impose order on chaos by reining in our imaginations with common sense, logic, and civil discussion.On the other hand, this reveals our deeply rooted conviction that there is a purpose to our existence and that there is true meaning in our lives and in our world.