As an avid fan of 2001: A Space Odyssey, I really despise the explanations given about the events, like
Of course, we come to find that HAL wasn't really "evil" at all, but had only been programmed, by forces in the White House no less, to keep the secret of the Jupiter monolith from those aboard the joint US/Russian space mission.
It takes away from the profound message the story really had. My explaining every detail, the magic and awe, the cosmic scale, the mystery, all of it was just gone.