Security
Security is freedom from, or resilience against, potential harm (or other unwanted coercive change) from external forces. Beneficiaries (technically referents) of security may be persons and social groups, objects and institutions, ecosystems, and any other entity or phenomenon vulnerable to unwanted change by its environment.
Terrorism
Terrorism is, in the broadest sense, the use of intentionally indiscriminate violence as a means to create terror among masses of people; or fear to achieve a financial, political, religious or ideological aim. It is used in this regard primarily to refer to violence against peacetime targets or in war against non-combatants. The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century but gained mainstream popularity during the U.S. Presidency of Ronald Reagan (1981–89) after the 1983 Beirut barracks bombings and again after the attacks on New York City and Washington, D.C. in September 2001 and on Bali in October 2002.
Violence
Violence is defined by the World Health Organization as "the intentional use of physical force or power, threatened or actual, against oneself, another person, or against a group or community, which either results in or has a high likelihood of resulting in injury, death, psychological harm, maldevelopment, or deprivation," although the group acknowledges that the inclusion of "the use of power" in its definition expands on the conventional understanding of the word. This definition involves intentionality with the committing of the act itself, irrespective of the outcome it produces. However, generally, anything that is excited in an injurious or damaging way may be described as violent even if not meant to be violence (by a person and against a person).
Violence
No matter what someone else has done, it still matters how we treat people. It matters to our humanity that we treat offenders according to standards that we recognize as just. Justice is not revenge — it's deciding for a solution that is oriented towards peace, peace being the harder but more human way of reacting to injury. That is the very basis of the idea of rights.
Judith Butler, The Believer, Interview - Issue 2.
Terrorism
Governments are terrorists, but they hide their actions behind the label of nationalism and patriotism: war becomes defense; theft becomes 'taxation'; slavery becomes 'conscription'; terrorism becomes 'defense.' Few people question the violations; rather, if they do protest, it is because the government is oppressing the 'wrong' group of people, and not because they regard coercion itself as wrong.
L.K. Samuels, Facets of Liberty: A Libertarian Primer, edited L.K. Samuels, Freeland Press (2009), chapter 17: “Who’s Afraid of No Government” pp. 139-140.
Violence
Violence, naked force, has settled more issues in history than has any other factor, and the contrary opinion is wishful thinking at its worst.
Robert A. Heinlein, in Starship Troopers (1959).