"A whole new system of law? That's far too complicated. Nobody could ever learn it, let alone live by it."
Too complicated compared to what? Before you measure the Law of the Earth, take a look at the measuring stick: the system you already live under.
It's too big to know
Do you know how many laws your country has? In some countries, including the United States, nobody knows. Not the Department of Justice, not the Library of Congress, not any office in the entire government. No one can answer the simple question of how many laws there are.
There are so many that you are almost certainly breaking some right now. It's practically impossible to go through a day without violating some code, statute, or regulation. Simply by existing, you are a criminal, and there's nothing you can do about it.
By comparison, here is the Law of the Earth:

Which seems crazier: a law you can carry in your pocket and consult whenever you need it, or a law that can't be moved without a truck?
It's too complicated to understand
The existence of lawyers proves that something is wrong. An entire profession exists to work out how your legal system operates, because no ordinary person can. People study for years just to begin understanding it, and even then they master only one corner of it. No one understands the whole thing. No one.
If your "law" is so complex that the people bound by it can't understand it, isn't it obvious that something is wrong with it?
The Law of the Earth rests on one principle, and everything else follows from it by plain reasoning. You can read it in an afternoon, and check every line of it against your own conscience. To see how it fits together, start with How the Law Works.
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Other objections: This is crazy / woo-woo! · What gives you the authority? · Laws come from nations and governments · Laws come from God · Laws come from the consensus of the People

