A trolley is approaching a track junction, and you happen to be standing by the switch. If you do nothing, the trolley will kill a number of innocent children playing on the tracks. If you throw the switch, it will kill only one fat man, who is sleeping on the tracks. The so-called Trolley Problem sheds light on many claims in moral philosophy: utilitarian positions (doing what's best for the greatest number), the difference between doing and letting happen (being more obliged to not cause harm than to prevent harm), and issues of "collateral damage" (killing one person to save others). John and Ken ride the trolley with Thomas Cathcart, author ofThe Trolley Problem, or Would You Throw the Fat Guy Off the Bridge: A Philosophical Conundrum.
To start off the show, Ken presents the thought experiment referred to as the trolley problem. Say you’re on a trolley headed down a track towards five people. You can choose to switch tracks, and on the other track, there is only one person. John says his answer is obvious: he would choose to act to save the five at the loss of the one life. The two agree John’s answer is motivated by utilitarianism, a moral philosophy that aims to maximize the total benefit to all people.
约翰和肯接着欢迎他们的嘉宾托马斯·卡思卡特来到节目。他们首先讨论了电车问题和人行桥的不同之处，在人行桥的例子中，你不需要改变轨道来救五个人，而是需要把一个人推下桥来阻止电车。人们的直觉通常会让他们说，他们不会推那个人，即使他们会牺牲另一个轨道上的人。托马斯对解释这种差异的原因很感兴趣。肯认为我们的心理机制可以解释我们对这些情况的直觉反应。
Thomas believes the best way to explain the difference is by the notion of double effect. In the trolley problem, the direct effect of switching tracks seems to be saving lives, while the secondary effect is sacrificing a life. On the other hand, in the footbridge case, the direct effect of the questioned action is to kill a man. This stirs our moral intuitions against the action of pushing the man off the bridge. Ken argues that the cases are still equivalent: someone is going to die because of you in either scenario.
A caller raises the issue of how we respond if we are personally connected to the person we must sacrifice. All agree that this of course makes people much more hesitant. Thomas asks the caller how many more people would have to be on the track for him to be willing to sacrifice his own father to save them. Questions like these make our intuitions about the topic even more difficult to pin down. Ken and John end the show by noting that getting at real answers in moral philosophy is very hard because of cases where our emotions are involved.
