Pat likes to ride his bike. He is a bit of a rebel. Sometimes when he is feeling particularly rebellious he does not wear his helmet. One day when he was riding his bike without a helmet a police officer, Emma, caught him. Emma told Pat he was breaking the law by not wearing his helmet. Pat exclaimed, “What?! Why is there a law making me wear my helmet? I am only going to hurt myself!”

What is the MAIN purpose of this kind of law?