Society should require that the spirit and purpose of any law be included as a preamble to that law's text and be used in the interpretation, application, and future adaptation of that law.
I agree, and it mostly is. I'm pretty sure it is always recorded when a congressman speaks about a bill, plus they always show dissenting opinions of the SCOTUS.
However, one major problem is that language changes with time. Words go out of favor, and change meaning. Sometimes they change their meaning to be the exact opposite. Sometimes there are contenpary dictionaries with conflicting definitions.
I think all laws should have an expiration date, and have to be debated, and possibly reworded again and again over the generations.