Here is my advice to Toyota engineer's on how to present this case to the public:
1. Be totally transparent.
2. Describe the process by which you use to derive root cause.
3. Provide the statistics and evidence gathered in a succient and understandable form that follows the process described.
4. Show how this evidence supports the root cause hypothesis.
I think if this was displayed in a clear and direct manner, rather than in the form of a mea culpa or obligatory advert (e.g. a Toyota engineer saying that she is confident of the vehicle, blah blah), Toyota would go a long way in reducing the amount of confusion and noise on this topic.