Lawmakers also make and pass laws because it's their job, not because a new law is needed. They feel it's literally their job to come up with new bills to pass, for no reason other than "it's my job".
Imagine a society so stable it doesn't need new laws or rules. All the elected representatives would just sit around all day and twiddle their thumbs. A bad look in their eyes.
Things change - e.g. 50 years ago no online chats, no drones, very little terrorism, travel was more costly and slower, medical drugs were less efficient, live span was shorter.
Same in the US. It was not a good time. The FBI recorded five bombings a day in 1971-72. Airliners were being hijacked once a week at the peak around then.
Imagine a society so stable it doesn't need new laws or rules. All the elected representatives would just sit around all day and twiddle their thumbs. A bad look in their eyes.
This is how it should be of course.