Bejnjamin's Franklin take on the formula. It could be a billion and it wouldn't change, it's just a saying. Stemming from presumption of innocence and the standard of proof required to establish guilt. Most rape cases end in "he said, she said" and that doesn't meet that standard. Unless you want to turn the legal system in its head just for rape for some emotional-driven reason, that's the reality we live in. The alternative is drastic shift towards authoritarian practices.
Not sure how that's relevant. I haven't compared the two, Dick Cheney hasn't compared the two. The part applying to lie detectors was the first one. Since lie detectors are pseudoscience they infringe on Blackstone's formulation and the rest of procedural law that's tied to it.
War is chaotic, courtroom is not. It's obvious different rules apply. On top of that, modern law of war and rules of engagement operate on attempting to reduce innocent losses to the minimum if not eliminating them altogether. What you're proposing for criminal law does the opposite so even your bad analogy works against you.