OP Summary:
The CIA destroying evidence that otherwise should have been involved in the 9/11 commission investigation. This is a conspiracy and subsequent cover-up that has to do with the events, perpetrators and players of 9/11.
BTW, we're talking rat-bastards here, not science. Start an appropriate investigation into the rat-bastards and then we can apply all of the science in the world to help develop well-informed conclusions.
What you duh-nilers seem to forget is that the passage of time is a criminal's best friend. And that's a more important fundamental tenant of empirical thinking and the scientific method.
I'm interested in reaching as much truth about this matter as is possible. For the CIA to destroy the tapes, in a bid to hide something, it cannot be that the Al-Qaeda ops we're denying there role in 911. It also cannot be that they admitted to doing it. Both of these situations would be expected and have no controversy. The most likely reason these tapes would be destroyed would be to hide who helped them execute the plot. The whole world outside of America knows that we torture folks. So this couldn't be the issue with these tapes either.
Whether it be a foreign country that the administration does not want to strain relations or "GASP" our own government itself.