Laws were needed to justify the need for order in the rising complexity of the civilization so as more laws were written more were enforced and more were needed to justify that enforcement
Written Laws were needed to keep control of all citizens.
Explanation:
As early societies became larger, more people were involved in societies. The more complex a society the harder it will be for everyone to follow societal rules. The more people, the harder it is to control people through oral laws. So written laws set a standard in society to keep the functional in earlier societies.
