This analysis from Jane Smiley sounds about right:
[W]hat I think happened is that when the Bush/Scowcroft/Baker faction decided to use Little George as their presidential poster boy to expand their Middle-East-based wealth and power, they didn't reckon with Cheney and Rumsfeld. They thought their boy would be personable and easy to control.
The key moment was when Cheney went looking for a vice-presidential candidate and found himself. Once they had given him the opening and he had publicly used it to aggrandize himself and his agenda, B/S/B realized that for the sake of party solidarity, they had to live with it. When Baker engineered the coup that was Florida (and I do think one of the "perks" Bush offered as a candidate was that Florida was guaranteed ahead of time by Jeb and K. Harris), I think that B/S/B and C/R found themselves in an uneasy alliance -- goals were the same, but temperaments were different. Right there at the pivot was Little George.
It's pretty clear that Little George requires a constant stream of flattery and cajolery to keep him going, and this was to be supplied by Harriet Miers, Karen Hughes, and Condi Rice...
At the same time, Little George has a hard time with bad news, so he was never going be told the truth -- he can't take the truth, as Jack Nicholson might say. This is evident in the famous 9/11 film of Bush reading about his pet goat when he gets news of the WTC...
But he did get a feel, just a little feel, right after the attacks, of what it might be like to lead the nation. He got a feel and he liked it, and for the purposes of the neocons, it was a good feel and it gave them something to build on in their plan to overcome the cautious side of his nature, represented by B/S/B...
How do you build yourself a madman? Well, first you flatter him, and then you try never to make him angry, and then you feed him ideas that flatter him even more by making him seem to himself sentimentally visionary and powerful and righteous. You appeal to his already evident mean streak and his hot temper by reminding him all the time that he has enemies, and you cultivate his religious side so that the sense of righteous victimization inherent in extreme religion comes out...
So, here he is, Little George, caught between the devil (Cheney) and the deep blue sea (fifty-some years of being infantilized by B/S/B). Cheney and Rumsfeld, aided by Rice and Miers and Hughes, convince him that his masculinity will only be enhanced by doing all the masculine things he missed out on over the years, especially making war. And Gerson gives his war a virtuous, godly gloss.
And Gerson's words come out of his mouth so often that he believes them and thinks they are his. In the meantime, Karl Rove continues to think that he is the maestro, playing Little George (and his base and the rest of the nation) like his own personal piano...
Little George isn't the same guy he was in 2000, the guy described by Gail Sheehy in her Vanity Fair profile -- hyper-competitive and dyslexic, prone to cheat at games, always swinging between screwing up and making up, hating criticism and disagreement, careless of others but often charming. He is no longer the guy who the Republicans thought they could control (unlike, say, McCain).
The small pathologies of Bush the candidate have, thanks to the purposes of the neocons and the religious right, been enhanced and upgraded. We have a bona fide madman now, who thinks of himself in a grandiose way as single-handedly turning the tide of history. Some of his Frankensteins have bailed, some haven't dared to, and others still seem to believe. His actions and his orders, especially about Iran, seem to be telling us that he will stop at nothing to prove his dominance. The elder Bush(es), Scrowcroft, Baker, and their friends, Cheney, Rumsfeld, Gerson, and the neocons have made the monster and in the process endangered the country, the Constitution, and the world, not to mention the sanity of wretches like Jose Padilla.