Yeah, I know... but I can think of no theory that fits all the pieces together as well. They found OTHER bombs inside the building. Here is a link to local OKC news broadcasts where they reported that bombs were taken out of the wreckage, then later reported on-air that the FBI agents inside the bldg confirmed to them the existance of these bombs.
The truck left no crater commensurate with an explosion big enough to destroy a steel reinforced concrete bldg some distance away. The truck wasn't parked next to the area where the building suffered the most damage, etc etc...
Cynthia McKinney made a wild accusation without a shred of evidence. There are many many unexplainable things about this case, from withheld evidence to eyewitness testimony of unlocated John Does to on-air broadcasts of OTHER bombs... there is a LOT here.