Why when the evidence suggest America was lead into an illegal war, conservatives fight against the truth?

Inherent inability to discern truth from propaganda. After years of being conditioned to accept the mindset that the US is a righteous nation superior to all others they have an unshakable faith that the government would never propagate a lie on such a large scale to the American public. They don't believe the US government would wage a war for nefarious reasons or do anything harmful to US citizens. They believe the US government has the best interests of the country at heart and this will never change no matter what you tell them or show them. They will dismiss truth that does not match with their beliefs as lies of the liberal media or liberal nonsense trying to destroy the US because they hate Bush.