Moral disgust
The visceral revulsion of physical disgust, recruited to condemn moral wrongs.
What it means
Moral disgust is the experience of disgust — an emotion that evolved to repel contaminants and pathogens — in response to moral violations such as betrayal, cruelty, hypocrisy, or degrading acts. A central debate is whether this is genuine disgust sharing machinery with the physical kind, or merely metaphorical language layered over anger; evidence that incidental physical disgust (a foul smell, a dirty room) can make moral judgments harsher suggests a real overlap. The function appears to be marking certain acts and people as morally contaminating, motivating avoidance, social rejection, and a desire for purification rather than the confrontation that anger invites. Critics note that disgust is a poor moral guide because it tracks contamination cues rather than harm, so it can drive prejudice toward out-groups and stigmatized behaviors that violate no one's rights. It matters for understanding moralization, intergroup hostility, and why purity-based moral arguments resist reasoned rebuttal.
Examples
People induced to feel disgust by a bad taste or a filthy desk judge unrelated moral transgressions more severely than those in a neutral state.
When a colleague is caught quietly passing off other people's work as his own, people say he makes their skin crawl and want him moved off the floor rather than argued with.
Told that a stranger sleeps on a mattress salvaged from a skip, many people call it wrong even after agreeing, when pressed, that nobody at all is harmed by it.
First described in Rozin, Haidt & McCauley; moral foundations work by Haidt.