The question is not so much: Dead or Alive?
The real question is: guilty or not guilty?
When someone produces credible evidence that Osama bin Laden or any of his cadre were involved in 911, then there might be some justification for debating the reality of his continued existence.
We've already seen faked video tapes of OBL, and as Larry points out elsewhere in this thread, it is relatively easy for skilled technicians to fake or doctor audio, so I'm very skeptical of this latest "find."
Keep in mind please that in the minds of those clamoring to continue, indeed escalate this so-called "War on Terror," a living, beathing Osama bin Laden suits their purposes to a T, especially if the people fail to consider that his responsibility for 911 has not been established.
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