They would immediately buy a combustion engine vehicle and avoid the issue completely.

Response $2$ of $3$: They would probably demand further investigation to determine whether we are acting ethically.They would probably demand further investigation to determine whether we are acting ethically.

Response $3$ of $3$: They would agree that we aren$$t responsible for enforcing laws in another country and so we are acting ethically by using the cobalt despite not knowing its origin. They would agree that we aren$$t responsible for enforcing laws in another country and so we are acting ethically by using the cobalt despite not knowing its origin.