A conspiracy theory attempts to explain the ultimate cause of an event (usually a political, social, or historical event) as a secret, and often deceptive, plot by a covert alliance of powerful people or organizations rather than as an overt activity or as natural occurrence. Advocates of conspiratorial views claim that most major events in history have been dominated by conspirators who manipulate political happenings from behind the scenes.

QUOTE WHICH SUMS IT UP

To me this quote sums up why conspiracies happen, it's about intellectual control of the populace. In this case why you would fight a war..

"In accordance with the principles of doubthink it does not matter if the war is not real, or when it is, victory is not possible. The war is not meant to be won, it is meant to be continuous. The essential act of modern warfare is the destruction of the produce of human labour. A hierarchical society is only possible and the basis of poverty and ignorance. In principle, the war effort is always planned to keep society of the brink of starvation. The war is waged by the ruling group against its own subjects. And its object is not victory over Eurasia or Eastasia, but to keep the very structure of society in tact. "

Goldstein's Book - 1984 by George Orwell

Alternative 3 - The Most Dangerous TV Show Ever Made