Here is the simple answer (the one that ignores the political overtones):
The commission was created not to assign blame for the attacks on Bush, Clinton, etc.
Rather, its goal is to study what went wrong with the US intelligence, law enforcement, security and policy efforts? In other words, they're trying to figure out why we didn't see this coming and what we can do to stop something like this from happening again.
Of course, regardless of the original motive, those commissioners who are still active in the political game have an incentive to make it look bad for the other party.
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