Laws are reactive by nature. Nobody can dream up something like you can't carry goldfish on a bus unless some assholes cause problems carrying goldfish on buses and there are enough people with wet feet to elect someone who pledges to do something about the problem. Unfortunately, once that problem is solved, the guy who got elected has to pledge to fix other problems, or his worthlessness will be unveiled.
Often, these people pledge to make a law in honor of some dead person. These are the worst types of laws because they generally are an attempt to make something that is already illegal easier to prove, or to have more teeth.
