Terrorism
Terrorist acts frequently have a political purpose. Some official, governmental definitions of terrorism use the criterion of the illegitimacy or unlawfulness of the act. to distinguish between actions authorized by a government (and thus "lawful") and those of other actors, including individuals and small groups. For example, carrying out a strategic bombing on an enemy city, which is designed to affect civilian support for a cause, would not be considered terrorism if it were authorized by a government. This criterion is inherently problematic and is not universally accepted, because: it denies the existence of state terrorism. An associated term is violent non-state actor.
Islamic terrorism
Islamist-based fundamentalist terrorism against Western nations and the U.S. in particular, has numerous motivations and takes place the larger context of a complex and tense relationship between the 'West' and the Arab and Muslim 'world,' which is highlighted in the previous section on motivations and Islamic terrorism. Identity-based theoretical frameworks, including theories of social identity, social categorization theory, and psychodynamics are used to explain the reasons terrorism occurs.