The issue here is not regulation of lobbying. It's the very simple fact that driving a car creates substantial risks that have a price. Someone must pay that price. Owners and operators of dangerous instrumentalities are much more appropriate to bear that price than injured third parties. Owners are much more likely to be able to bear the cost than operators. If you shield owners, than you are practically shifting the burden to the public. I.e. socializing the costs. Yes it's great for small businesses to shift the costs of their profit-making activity to the public.
Ms. Fong's ownership of the car gives her the right to profit by renting it. It is fair to link that right with the obligation for risks created by that profit-making activity.