Vox
June 30, 2026
TL;DR
The feeling of guilt after killing bugs—even when justified—is called moral residue, a phenomenon that occurs when you do something you believe is right but also morally wrong.
“It happens when you do something you think is right but also wrong, like killing living creatures for the greater good.”
— Narrator
“I have decided I will be stomping lantern flies this summer. Just not gleefully.”
— Narrator
1. The Invasive Lantern Fly Problem
Every summer on the East Coast, people are encouraged to kill invasive spotted lantern flies to protect crops, especially grapes. The goal isn't total eradication but slowing the spread to give unprepared regions time to prepare.
2. Three Ethical Frameworks for Justification
Consequentialism judges decisions by their outcomes, deontology considers motivations, and virtue ethics examines character. All three frameworks can provide valid reasons for killing lantern flies.
3. Moral Residue: The Discomfort of Justified Actions
Despite logical justification, the act of killing living creatures for the greater good produces a persistent feeling of guilt called moral residue—the discomfort of doing something that feels both right and wrong simultaneously.
4. A Personal Resolution
The speaker decides to participate in killing lantern flies this summer but will do so without joy or satisfaction, acknowledging the moral weight of the action.