Go here, and read the report of an investigator (not a government investigator!) who argues that there was a link between the Oklahoma and New York attacks, and that Timothy McVeigh was not alone but was a member of a cell.
If this is true, it sucks. And it makes the current Able Danger inquiry all the more, shall we say, poignant.
I always am suspicious of stories that require a belief in government conspiracies to cover up the truth. If given a choice between "hiding something" and "too stupid to find it right under their noses," I favor the latter, based pretty-much on experiences with a few federal officials who, once they've developed a theory, will employ the entire might of the federal government to confirm their theory. No matter how implausible, boneheaded, or flat impossible.
But I don't think we've ever heard a convincing explanation of McVeigh's and Nichols' motivation in blowing up the Murrah Center. I mean, when you go through considerable premeditation and preparation, you have to have a purpose in mind, right? Or else, you have employers who have a purpose and you merely have a job to do and your only purpose is to get the job done.
I don't know what it is, but something isn't right.