Why Do People Call Various Beliefs ‘Cancer’?

Alliance Theory treats moral language as coalition technology. Words like “evil,” “racist,” “fascist,” and “cancer” do not primarily describe the world. They mark sides, recruit allies, and coordinate action against enemies. The vocabulary tracks who you stand with more than what you observe.
“Cancer” is a high-grade weapon in this vocabulary.
It forecloses negotiation. You do not debate cancer or seek common ground with it. The metaphor pre-loads the only legitimate response: excision. Once an ideology gets the cancer label, anyone who proposes engagement, reform, or coexistence sounds like a man recommending you live with your tumor.
It medicalizes politics, which puts the speaker in the role of healer. The opponent is no longer a fellow citizen with different interests but a sick growth on the body politic. This raises the speaker’s coalition to physicians and lowers the target to disease.
It recruits bystanders cheaply. Few people defend cancer. The metaphor pulls in third parties who might otherwise stay neutral, since opposing cancer reads as common sense rather than a partisan stand. Pinsof emphasizes how moral talk works by mobilizing audiences, and “cancer” optimizes for that mobilization.
It licenses what is otherwise off-limits. You can do things to cancer you cannot do to opponents. Surveillance, exclusion, firing, criminalization, and violence all become defensible once the target gets reframed as a malignancy threatening the host. The metaphor naturalizes severity.
It binds the in-group through shared enemy. Coalitions cohere around what they oppose more reliably than around what they affirm. Calling the other side cancer gives your coalition a unifying threat and a shared mission of eradication.
The symmetry is the giveaway. The right calls wokeness cancer. The left calls White supremacy cancer. Religious traditionalists call secular liberalism cancer. New atheists called religion a cancer. Hamas calls Zionism cancer. Settlers call Hamas cancer. Every coalition reaches for the same metaphor about its primary enemy, as Pinsof predicts.
Trivers adds that the speaker usually believes the framing. Self-deception makes recruitment more effective, since visible conviction persuades better than calculated rhetoric. The man who calls an ideology cancer rarely thinks of himself as deploying coalition technology. He thinks he sees a tumor.
Becker adds the hero-system layer. Calling something cancer casts the speaker as defender of the body against existential threat. That role supplies meaning, identity, and standing. The metaphor places the user in a heroic story about saving the host from death.