I agree, TDK, except for one thing- from Starfleet's perspective, it hasn't been established yet that he HAS disobeyed (let alone that he did so deliberately).
Until that comes out, it's still an inquiry into the violation of the Rules of Engagement and whether or not it was deliberate.
They can't start asking WHY he disobeyed an order until they've established that he HAS disobeyed an order.
Once they start pulling on that thread, however, the whole know begins coming loose!:D