Why let Rudolph avoid trial?

Orcinus has a good post today querying why the Justice Department let Eric Rudolph plead guilty and avoid trial in return for showing them where some dynamite was hidden. His conclusion, which I generally agree with, is that they may have been motivated to some degree by an unwillingness to contradict the Bush Administration's "terrorism" narrative. In that narrative, terrorists are A-rabs and sand-niggers, and clean cut white boys just don't fit the picture. More importantly, it's A-rabs that do the killin', not good Christian men who espouse the culture of life.