You say Similarly, Israelite legal cases would have correctly been adjudicated on the basis of the law rather than on how the politics of Promised-Land invasion strategies were going, and whether you sided with the two or the ten spies.
According to Torah, what matters is what the court decides, and this is ultimately what the people of God must depend upon. The codified law (written Torah) is not self-interpreting, and the particular cases that are reserved for the court included conflict between two legal rights: two laws (not to mention the interpretation of factual patterns and applicable law.) Sometimes in these instances the court must create a third law to settle a dispute between the two; other times it must actually overrule one of the laws. In either case, simply adjudicating the situation on "the basis of the law" simply doesn't work if, by that, you mean only the codified law as it exists and is understood by the court and parties at the time of the controversy. If the matter were really that straightfoward, Moses would have had no reason to contemplate his burden; Jethro would have had no reason to offer a solution; and God would have had no reason to create a Levitical court in the first place.
