Your own post says it all.
Nothing about preventing attacks on America, or finding out what went wrong. Everything about blaming Bush for 9/11. A good clue that this is political for the Democrats and the media is when the buck apparently stops in January of 2001, and nobody further back is to blame.
From David Frum at the National Review:
This administration came into office to discover that al Qaeda had been allowed to grow into a full-blown menace. It lost six precious weeks to the Florida recount – and then weeks after Inauguration Day to the go-slow confirmation procedures of a 50-50 Senate. As late as the summer of 2001, pitifully few of Bush’s own people had taken their jobs at State, Defense, and the NSC. Then it was hit by 9/11. And now, now the same people who allowed al Qaeda to grow up, who delayed the staffing of the administration, who did nothing when it was their turn to act, who said nothing when they could have spoken in advance of the attack – these same people accuse George Bush of doing too little? There’s a long answer to give folks like that – and also a short one. And the short one is: How dare you?