Conspiracy theories exist for two reasons: paranoid crazy people and stories that don't add up. There is nothing you can do about the first reason. There are two ways to avoid the second reason: by giving the all facts or by getting your story straight. Unfortunately, people in the intelligence business always dissemble, so you are left with method two. If you fail badly at getting your story straight, you will actually spawn a counter conspiracy theory which states that you are intentionally trying to create a conspiracy theory.
And yes, I am a paranoid crazy person. ^__^