It seems the company wants to insure the driver, not the vehicle, which
makes perfect sense. Let's say you have no tickets or accidents for 11
years, and a low premium to go along with it. Your friend's one of these
morons who has an accident and a serious ticket every 18 months. Why
should your policy cover him? Makes no sense, unless you think the goal
of a business is to lose money. His policy should cover him, no matter
whose vehicle he's driving.
Do you understand what an umbrella policy is? Apparently not.