From Slate, Jacob Weisberg on How Bush chose stupidity.

But if "numskull" is an imprecise description of the president, it is not altogether inaccurate. Bush may not have been born stupid, but he has achieved stupidity, and now he wears it as a badge of honor. What makes mocking this president fair as well as funny is that Bush is, or at least once was, capable of learning, reading, and thinking. We know he has discipline and can work hard (at least when the goal is reducing his time for a three-mile run). Instead he chose to coast, for most of his life, on name, charm, good looks, and the easy access to capital afforded by family connections.

It's pretty brutal, in a quiet sort of way.