So if you think about it, this is an extreme-case scenario, because in the real world, whenever you are taking passenger's seat, very often the driver is going to be someone you trust, an expert, etc. So this is an extreme-case scenario.
所以你会觉得，这是个特殊的案例， 因为在现实中， 无论何时你坐上“乘客”的位置， 大多情况下“司机”都是你信任的人， 例如一个专家，等等。所以这是个特殊的案例。