Because, unsurprising, he didn't think things through:
George W. Bush's political opponents will surely revile him long after he's gone. But you can be sure of this: Just as the Bush presidency led Democrats to express an unexpected nostalgia for Ronald Reagan, the next Republican president can expect to hear from pundits and academics alike that he falls far short of the high standard set by the last one."Absolutely, George W. Bush made the previous Republican President, George H.W. Bush, look like a genius.
Looking good in comparison to a disastrously incompetent President doesn't make you a great President - George H.W. Bush was adequate. But boy, does he look good by comparison. If the next Republican President makes us nostalgic for G.W., he would have to be a catastrophic disaster.