Mass Insanity explores the subjects of insane communities, the clash of identities, and how societies indoctrinate their members and shape their way of thinking. It uses theories of social, clinical and forensic psychology to analyse Islam. It explores Islamic invasions, piracy, slavery, terrorism, female genital mutilation, rape, suppression of human rights and critical thinking. It also discusses the decay of Western civilisation and the arising psychological difficulties. Why do millions of supposedly sane people endorse the assassination of writers, cartoonist, and journalists, the suppression of women, the killing of children, the destruction of art, culture and heritage? Can a society that includes millions of people lose its mind and how? In contrast, why would any country allow a group of people to immigrate, legally and illegally, to its territories to kill its children, rape its daughters, take its wealth, and destroy its identity? Why would a community lose the will to defend itself against an enemy seeking its demise? How could a society stand idly by and watch its own offspring being slain and raped? Again, are these healthy societies?