It's an argument for all crimes though. Why is 12 jurors acceptable for a conviction (unanimous, not unanimous), why not 1 or 1,000?
It seems almost circumstantial to the situation in where the crime took place that should dictate our confidence in any conviction. If someone walks into the centre of the KP and boots someone in the Jaffers (Rudkin ideally), you'd be more confident in convicting them than for something that happens behind closed doors when it's one person's word against another (exemplified by the appalling low rape conviction rates).
Forget what it was called, but Channel 4 replicated a murder case and the jurors on the show returned a different verdict than that of the actual trial. Makes potential uses of AI all the more nefarious.