I've always had the strong feeling that we weren't being told everything about Okla City, and I was skeptical that a truck full of fertilizer could do that kind of damage. I agree that to build a bomb like that requires some knowledge and experience that neither McVeigh, nor Nichols appeared to have. Also, I thought that McVeigh came to trial and ran through his appeals extraordinarily fast and curiously didn't write a tell all book, or even give interviews that dropped "bombshells" before he was quickly executed.
All this points to cover-up by Bubba Klinton, but why? To keep from having to pursue a War on Terror or maybe he was getting kickbacks from the Saudis, etc. ?