Pseudoscience: Consists of statements, beliefs, or practices that are claimed to be both scientific and factual but are incompatible with the scientific method (unproven, not testable, or opposed to the consensus of traditional science).
Definition: AIDS denialism is the belief that HIV (Human Immunodeficiency Virus) and AIDS (Acquired Immune Deficiency Syndrome) aren’t linked. It is a belief that has fooled many people, including members of the rock band ‘Foo Fighters’. It has lead to the deaths of various people who have stopped medical treatment due to their beliefs.
Conclusion: AIDS Denialism is a deadly belief that has, sadly, been promoted by otherwise decent people, like Dave Grohl who has since embraced the HIV/AIDS link.