Richard Cohen of The Washington Post on …Unshakable Faith:
The favorite Bush grammatical construction is the tautology: Something is bad because it's bad. A synaptic leap is made in which a certain cause will have a certain effect — never mind why. Things are stated with certainty, but the proof of them is not apparent. This may explain why Bush seems so sanguine about presenting evidence of an Iraqi nuclear program that later turned out to be not true. It doesn't matter. Because it ought to be, it is.
In other words, "trust us – would we ever steer you wrong?"