Why does that not make sense? The law must cover everything from "dont kill certain species" to "don't commit this very specific type of fraud". Society is so advanced we need more laws. Of course Hamurabi's code was short because it didn't need to stop investment bankers committing fraud or voting laws to prevent racial bias or workers rights etc etc. Certainly there are improvements but you will never fit it all into one short book that a layperson could read.