From your link:

The key question remains — why did we go to war? It is not yet answered. In the end, it is likely that a host of responses will produce a cognitive stew, which does, at least, open the way to offering one’s own notion. We went to war, I could say, because we very much needed a war. The US economy was sinking, the market was gloomy and down, and some classic bastions of the erstwhile American faith (corporate integrity, the FBI, and the Catholic Church, to cite but three) had each suffered a separate and grievous loss of face. Since our Administration was probably not ready to solve any one of the serious problems before it, it was natural to feel the impulse to move into larger ventures, thrusts into the empyrean-war!