keep in mind that what we call fines, governments (federal, state, county and city) call revenue. So when a government entity starts to run short on revenue they look for new places to get it.
Kalifornia Politician 1: We're running out money. How can we suck more money out of our citizens?
Kalifornia Politician 2: I got it. Let's regulate the hunting of feral hogs. We can make people buy a license to hunt them. And if the hogs tear up someone property, which they always do, we can sell them permits to get rid of them. And since there's no difference between feral hogs and domestic pigs, we can fine people that kill their own hogs. They can fight it in court, but it would cost them more than the fine and we still collect court costs.
Does that sound farfetched?