The law in "Frost Age 2" is a very important thing in the game, especially for leaders. It is the most advantageous weapon in the leader's hand. When you encounter certain difficulties, you can modify the law. To solve the problem, amending the law has many functions. The first is to reduce public anger.
What is the use of changing the law in Ice Age 2
You'll likely find yourself regularly falling just short of the point where you feel comfortable with the city's overall stability. Maybe there aren't enough active workers to force you to cut back on certain areas, or maybe there's a negligible shortage of goods that doesn't cause any real problems (yet) but makes you worry about the future. In this case, creating or changing a law may be the solution you need.
Some laws need to be researched in the idea tree before they can be proposed in the committee.
This is especially important early in the game when you don't have any laws and making one will basically give you a bonus that you didn't have before. They can affect your workforce, citizen demand, and even hot ticket revenue. Later in the game, if a law becomes outdated and ineffective, feel free to change it!