2) simplicity - The code of law should be simple, and easily understood. While I don't object to the existence of lawyers, in principle... The law should be simple enough that any citizen can serve as a lawyer. A dispassionate advocate (without his own neck to worry about), will probably make a case more competently, than someone swayed by concern and anxiety for their own future. But the law should be simple.
...to resolve any in-group conflict that should arise.
And I have a few thoughts on the subject - a few principles that may be worth considering for anyone planning a community, or who should ever find themselves in a situation where it comes up out of necessity (such as in a post-collapse hellscape, for example).
1) practicality - how enforceable is a law? It's easy enough to say what should, or should not, be. But how easily can this be made into a reality? Who will enforce it? And how?
For legal reasons, let's consider what can be called: principles and theory of law - applicable to any legal system (past, present, and future, extant or hypothetical).
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When Prepping, there comes a point when broader considerations come to mind - when you've covered enough of Maslow's hierarchy of needs, that interpersonal interactions come to the fore. This to me, is when law should be considered.
What is the purpose of law? Primarily, to prevent in-group conflict. And secondarily, ➡️
I can easily envision a future that's like a Jackson Pollock painting: the canvas is the wasteland - a lawless wilderness of savage barbarity. And all the flecks of paint are attempts at civilization. Most will be improvised, and will exist only due to random alignment of circumstances. Very few will be well considered and planned. And through Darwinian processes, the fit communities will survive.
So what makes a community fit? I'd wager it would be the law that they choose to live under.