Buying a used car is not always "better" than a new one. It depends on how much your time is worth, and what utility you get out of your vehicle.

For example, if you live with a family and 1 person does not NEED a car, then they can be passed the oldest car, and when it's ready to junk, you buy a brand new one where you don't have to worry about the history of the car. Rinse, repeat, you will maximize the value obtained from each vehicle and not have to worry about how previous drivers or mechanics treated it.

This biggest expenses in cars are the surprise ones where you end up shelling out for towing or emergency repair or paying extra to buy a one since you are time constrained and can't shop. But if you have a spare car, then you have the luxury of using it until it's dead, and leisurely shopping for a deal when you need another.

Why whoud you pass a car to a person who doesn't need a car?

I meant need in the sense that it's mission critical, for their work pretty much. But suppose it's for retired grandparents, or a stay at home parent then it's not needed, but it is useful.