Final answer:
In the case of a passenger 17 or younger not wearing a seatbelt, the driver is usually held responsible, as laws mandate seatbelt use to protect individuals and reduce societal burdens.
Step-by-step explanation:
If a passenger 17 or younger is caught without a seatbelt on, the responsibility typically falls on the driver of the automobile. This is because laws are in place not only to protect individuals from their own potential foolish behavior, but also to reduce the societal burden of medical and physical care resulting from accidents. These laws mandate the use of seatbelts, and when minors are involved, they cannot be held legally responsible for their compliance; thus, the driver is held accountable for ensuring all passengers comply with seatbelt laws.