From the Senate report on intelligence failures: "That said, it is hard to deny the conclusion that intelligence analysts worked in an environment that did not encourage scepticism about the conventional wisdom."
The president is captain of the ship -- he is responsible for what goes on in his administration. It is pretty well established that they were looking for reasons to go to war -- not for an objective rendering of the situation.
Again, I point you to the Project for a New American Century's web site: Cheney, Rummy, Wolfy, et al. TOLD US THEY WANTED TO GO TO WAR WITH IRAQ back in the '90s. 9/11 gave them the excuse and they used everything they could to convince us war with Iraq was a necessity.
When you look for reasons to go to war, you find them... Is that the type of leadership people want? Starting with a preconceived end-state and looking for the evidence to support it while ignoring contrary evidence?
Bush is either president and responsible for his decisions or he is incompetent for not aggressively asking for all sides of the story... including dissenting opinions on WMD.