It's actually because incoming Republican administrations believe their own propaganda, and assume everything the previous Democratic administration did is wrong and evil. So it MUST be ignored and they MUST do the opposite. Happened with 9/11 too: Clinton's people warned them about an attack. They assumed Clinton's people were just trying to screw with them.
Republican theology seems to be steeped in this moronic idea that they create their own reality. You would think when passenger jets come crashing into their rosy little fantasy, they would figure out that reality exists and you can't just hold your breath and wish it away. It's 16 years later and they are STILL doing it!
It's even simpler than that. Just as thieves are certain that
everyone is a thief, lying, partisan hacks are certain that everyone is a lying, partisan hack.
