The same cognitive switch that lets us see humanity in animals can be inverted to ignore it in people. This 'evil twin,' dehumanization, makes it psychologically easier to harm others during conflict. Marketers and propagandists exploit both sides of this coin, using cute animals to build affinity and dehumanization to justify aggression.

Labeling a person or group as 'disgusting' is an effective political tactic because it's an emotional attack, not a logical one. While one can counter claims of incompetence with evidence, an accusation of disgust is nearly impossible to refute rationally, making the target defenseless.

In an experiment, participants filling out questionnaires in a room with a bad smell rated social groups, such as gay men, more negatively. This demonstrates that incidental feelings of disgust, even from an unrelated environmental source like a smell, can directly influence and bias our social judgments.

Unlike other forms of bigotry focused on exclusion, antisemitism often includes a belief in a global conspiracy by Jewish people, which is then used to justify violence against them as a necessary counter-action.

Across history, from Nazis calling Jews "pestilence" to Hutus calling Tutsis "cockroaches," propaganda follows a single playbook. By labeling an out-group as non-human (animals, viruses), it deactivates the brain's social cognition and empathy networks, making it psychologically easier to commit atrocities.

People remain disgusted by an object even when they intellectually know it's safe, such as a sterilized cockroach dipped in a drink. This demonstrates that disgust operates on a 'magical' or symbolic level, bypassing our rational faculties and making it a powerful, irrational force.

Donald Trump's debunked claim that immigrants were eating local pets illustrates a political tactic: linking an out-group to a disgusting act. This emotionally potent story bypasses rational thought, creating a powerful aversion that persists even after being fact-checked.

Unlike other emotions, disgust spreads through contamination in one direction. A single cockroach can render an entire platter of food inedible, but pouring a gallon of honey on the cockroach won't make it less disgusting. This principle highlights the powerful, irreversible nature of disgust.

Coined in 1879, "anti-Semitism" was not just a new word for old hatred. It was a modern political tool framing Jews as a foreign race ("Semites") to specifically oppose their emancipation and the Enlightenment values that enabled it.