The plan is really quite simple: cause as much chaos and horror in the world so that the only logical solution is a One World Government with very strict rules that everyone must obey for their own good.
There are two types of people in the world today: those who want a World Government and a World Religion subservient to the State and will do anything to bring it about, and those who believe that a World Government would usher in a Worldwide Tyranny the likes of which have, as of yet, never been known to Mankind.