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When the stiff-necked people wearied of trying to follow God's Will, He told them he would give them the rules to live by....When Jesus told us, if one broke even the least of the commandments, one broke them all as far as God was concerned.....following the Commandments, as written, was the price of a ticket through the Pearly Gates - and they were given to prove to us that we couldn't even follow 10 simple rules...resulting in Jesus being killed to redeem us....please don't rewrite the Bible or tell us "what God was really thinking" in order to explain that which you "know but cannot definitively prove" - without adding and/or subtracting from the Bible.
If what you say is true, then we should still be following the bits of the moral law of the time that said if one had a wet dream, he was unclean for the day and needed to separate himself from the group, etc., etc., etc.........
The Ten Commandments are not an exhaustive list of sinful behavior under Mosaic Law. Is it your contention that Leviticus and Deuteronomy are not part of the Bible? Is it your contention that there were no sins outside of the Ten Commandments? That seems to be your position.