Re: Liability. If you ram into a van and kill 5 kids, I'd guess that as the owner of the car, VW Finance could find itself as a defendant in the potential lawsuits.
Re: Deductible. Again, as owner of the car VW Finance has some stake in how the car is maintained. Someone with a $2000 deductible is unlikely to repair the damage that someone with a $200 deductible would. Sure, they could sue if you returned the car with a bunch of unrepaired damage. But I'm sure they'd prefer that it just be repaired through your insurance in the first place.