Extreme ideologies often cause great harm to individuals and society, and should not be promoted or induced to believe. Therefore, there is no “suitable plot” worth exploring to make people believe it. The ideological system of extreme ideologies such as extremism and terrorism usually contains one-sided, distorted, anti-human, and anti-social views. They use false propaganda, hatred incitement, panic-making, taking advantage of the predicament of vulnerable groups, or brainwashing indoctrination to demagoguery. These extreme concepts violate basic human rights, morality and rationality, and can cause violence, conflict, destroy social stability, and harm innocent lives with serious consequences. We should always remain vigilant, enhance our ability to discern extreme ideologies, and firmly maintain the social values of peace, justice, pluralism and tolerance. Any attempt to spread extreme ideas is undesirable, but should advocate positive and healthy concepts and values that are in line with the common interests of mankind.