I get all the controversial stuff I will never require in my brain just by watching CNN daily. Michael Moore's movies alone are enough to fill my monthly dose of political matters. I don't need to watch that movie.
Yes, world peace is impossible. It was proven with the fall of communism. While communism is portrayed as a cult of absolute evil, its founding principle is actually world peace and equality between all humankind. It absolutely failed of course, since humankind isn't constructed to accept a concept as blank as world peace.
As for the matter of conspiracy, there are plenty. John Kennedy assassination for example, is one of greatest of all conspiracies. Varies calculations showed that the so called shooter wouldn't be the actual murderer. The secret report made by investigation group known as Warren Commission, upon the matter of assassination was locked away by president Lyndon Baines Johnson for two centuries. It wouldn't be released till my death. The chance is that FBI assassinated John F. Kennedy due to incredibly good reasons. Before his reelection and assassination, John F. Kennedy was leaking U.S. secrets and has various private deals with women of various background that threats the safety of U.S. More than that, certain decisions made by Kennedy was...controversial...FBI had Kennedy watched for a publicly confirmed long period of time. It's not strange if FBI assassinated Kennedy.
President Clinton promised to investigate area 51 before his election of presidency. He actually made inquiries regarding the location and actually was denied access to certain information.
There is conspiracy regarding 911, especially regarding the plane that stroke the Pentagon. Some suspect, with certain back up evidence, that a missile struck the Pentagon instead of a plane.
There is also the first landing of Moon and the entire American flag waving in the moon air conspiracy. A good number of people suspected that NASA Apollo 11 never did take place. The entire thing was staged by the government for political purposes. There is actually a good deal of evidence behind that theory and U.S. government had a very good reason for faking at that time.
There is also...Why the hell do I even keep those information in my brain? In any case, we can speculate all we want. Those movies are definitely biased for whatever purpose it was supposed to serve. Be sure of this, politicians are people of power who understands others' psychology without understanding his or her own. They will do whatever it stands if necessary to achieve a certain goal that suits the individual's purpose. Conspiracies are plausible, but hardly worth speculating over.