How Does the Doctrine of Double Effect Apply to the Trolley Problem?

To understand how the Doctrine of Double Effect (DDE) applies to the Trolley Problem, one must examine the strict criteria that an action must satisfy to be considered morally permissible under the doctrine. These criteria help philosophers evaluate the classic variations of the trolley dilemma, specifically contrasting the 'Bystander' scenario with the 'Footbridge' scenario. By applying these rules, the DDE provides a rational justification for why some actions that result in death are permissible, while others are not.

The Four Criteria of the Doctrine of Double Effect

For an action with both good and bad effects to be permissible under the DDE, it must meet all of the following conditions simultaneously:

1. The Nature-of-the-Act Condition: The action itself, apart from its consequences, must be morally good or at least indifferent. It cannot be an act that is intrinsically wrong.
2. The Means-End Condition: The good effect must not be obtained by means of the bad effect. The bad effect cannot be the instrument or the stepping stone used to achieve the good.
3. The Right-Intention Condition: The agent must intend only the good effect. The bad effect may be foreseen, but it must not be intended as either an end or a means. If the bad effect could be avoided, the agent would avoid it.
4. The Proportionality Condition: There must be a sufficiently grave reason for permitting the bad effect, and the good effect must outweigh or equal the bad effect in moral weight.

Applying the Criteria to the Bystander Scenario

In the Bystander scenario, you pull a lever to divert a runaway trolley from a track with five people to a track with one person. Let us apply the four criteria:

• Nature of the Act: Diverting a trolley to a different track is a morally neutral act. It is not inherently wrong to turn a wheel or pull a switch.
• Means-End: The saving of the five people is not caused by the death of the one person. If the one person on the side track were to miraculously escape from the track, the five would still be saved. Thus, the bad effect is not the means to the good effect.
• Right Intention: The agent intends to save the five. The death of the one person is foreseen but completely unintended. The agent does not wish for the person to die.
• Proportionality: Saving five lives is a proportional reason to permit the foreseen death of one person.

Because all four conditions are met, the Doctrine of Double Effect declares pulling the lever to be morally permissible.

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Applying the Criteria to the Footbridge Scenario

In the Footbridge scenario, you push a large man off a bridge so that his body blocks the trolley, saving five people but killing him. Let us apply the criteria here:

• Nature of the Act: Pushing an innocent person to their death is inherently wrong, violating the first condition of the doctrine.
• Means-End: The saving of the five people is directly caused by the impact of the trolley hitting the man's body. If the man were to escape, the trolley would not stop, and the five would die. Therefore, the bad effect (the man being struck and killed) is the direct means to the good effect. This violates the second condition.
• Right Intention: Because the man's body must block the trolley, the agent must intend for the trolley to hit him. The harm is intended as a means, violating the third condition.
• Proportionality: While five lives are saved, the violation of the other conditions makes the act impermissible regardless of proportionality.

Because it fails multiple criteria, the Doctrine of Double Effect declares pushing the man to be morally impermissible. This application demonstrates how the DDE aligns with common moral intuitions while maintaining a non-consequentialist framework, showing that the way we achieve our goals matters just as much as the goals themselves.