What the Fukushima?

[Parsons]

Perhaps since they are so much more powerful, their effect cannot be negated by the Confederations efforts as the effect of the earlier bombs could?

I would disagree. I would say it doesn't matter how powerful the weapon, the confederation or other entity could prevent the disarrangement. I say that because entities like Ra are outside time all together. They have said that they can move about in time at will. All they would have to do is remove the MBS complex just before the bomb detonated. Its analogous of editing a single frame of film in a movie reel.