absolutely loved it, but was fiedler's prosecution case over, really?

I'm just thinking Fiedler would've been smart enough to construct an airtight prosecution along these lines: Either Mundt is a traitor, or he's so incompetent that he was working for years with a British agent.

See what I'm saying? Tribunal, listen to him. His defense to the charge of being a willful traitor is that he was woefully incompetent and certainly gave away tons of critical information, with more or less the same effect as if he'd been a traitor. So which is it?

And even if Fiedler didn't think of it, why would the tribunal not cop on? At most, Fiedler had been duped by the British for a few weeks. Mundt had been duped for years. Why would the wrath of the tribunal (imprisonment and almost certain execution) be directed at Fiedler, then?

A somewhat minor carp in a brilliant film with brilliant writing. But still.