this would explain his optimism in the face of disaster

From Atrios :

Ben Wikler provides us with a choice excerpt from the Nelson report, a long running insider tipsheet generally considered to be quite reliable:
There is rising concern amongst senior officials that President Bush does not grasp the increasingly grim reality of the security situation in Iraq because he refuses to listen to that type of information. Our sources say that attempts to brief Bush on various grim realities have been personally rebuffed by the President, who actually says that he does not want to hear "bad news."

Rather, Bush makes clear that all he wants are progress reports, where they exist, and those facts which seem to support his declared mission in Iraq...building democracy. "That's all he wants to hear about," we have been told. So "in" are the latest totals on school openings, and "out" are reports from senior US military commanders (and those intelligence experts still on the job) that they see an insurgency becoming increasingly effective, and their projection that "it will just get worse."

Our sources are firm in that they conclude this "good news only" directive comes from Bush himself; that is, it is not a trap or cocoon thrown around the President by National Security Advisor Rice, Vice President Cheney, and DOD Secretary Rumsfeld. In any event, whether self-imposed, or due to manipulation by irresponsible subordinates, the information/intelligence vacuum at the highest levels of the White House increasingly frightens those officials interested in objective assessment, and not just selling a political message.
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We knew that bush doesn't watch or read the news, but to refuse to hear anything, even from his own advisors, that doesn't jive with his happy, optimistic picture is pretty.....insane!
Damn, for the days of a president that actually listened to advisors and paid attention to what was happening in the world!