Why would Israel reject ex New Zealand Prime Minister Geoffrey Palmer- to head an inquiry?

Is their something wrong with him? There was to be an Israeli investigator too BTW. Why is this unacceptable? Third party inquiries are done all over the wold form the international stage to local police departments. Surely not every single person in the world is out to get Israel. Why can't they agree to at... show more Is their something wrong with him? There was to be an Israeli investigator too BTW. Why is this unacceptable? Third party inquiries are done all over the wold form the international stage to local police departments. Surely not every single person in the world is out to get Israel. Why can't they agree to at least let him be PART of the investigation (even that was turned down). Is there something wrong with his credentials?
Update: @simple simon, I believe that's why there should be an investigation, but not only to assess blame but to help ensure it doesn't happen again. You didn't address the question.
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