Having escalating fines for repeat offenders (as for DUI aficionados) is the metaphorical 2X4 that even delusional idiots eventually understand.
Escalating fines is not the same thing as adding a law for something already illegal. Here let me help you as you have difficulties fittings analogous thoughts together:
Adding a new law IE making it illegal to use a cell phone for driving because you may run a red light (running red lights and running over people in walkways is already illegal) is analogous to making it illegal to carry a gun into a school even though it is already illegal to shoot people at random, whether in a school or not.