Robert Oppenheimer quote: “The extreme danger to mankind inherent in the proposal [to develop thermonuclear weapons] wholly outweighs any military…”

“Modern science and technology have reached a level where there is the grave danger that a weapon even more terrible than nuclear weapons may be developed. The reason and conscience of mankind dictate the need to erect an insuperable barrier barrier to the development of such a weapon.”

Leonid Brezhnev (1906–1982) General Secretary of the Communist Party of the Soviet Union

As quoted in Nuclear Disarmament (1979) by Aleksandr Efremovich Efremov

“Three technical aspects of thermonuclear weapons have made thermonuclear war a peril to the very existence of humanity. These aspects are: the enormous destructive power of a thermonuclear explosion, the relative cheapness of rocket-thermonuclear weapons, and the practical impossibility of an effective defense against a massive rocket-nuclear attack.”

Andrei Sakharov (1921–1989) Soviet nuclear physicist and human rights activist

Progress, Coexistence and Intellectual Freedom (1968), Dangers, The Threat of Nuclear War

“The group believes that whatever deterrent value nuclear weapons had in the Cold War is now outweighed by the dangers of proliferation and nuclear terrorism.”

Valerie Plame (1963) American spy

"Reaching Global Zero" (8 March 2011) http://www.huffingtonpost.com/valerie-plame-wilson/nuclear-proliferation_b_832399.html
Context: Without doubt, terrorist groups are trying to buy, build or steal a bomb. Furthermore, there is enough highly-enriched uranium (HEU) in the world to build more than 100,000 weapons, and rogue individuals are selling technology on the black market. If terrorists get hold of HEU, they could not be prevented from smuggling it into a targeted city, building a bomb and exploding it.
To my mind, the only realistic solution to this danger is to lock down all nuclear materials and eliminate all nuclear weapons in all countries: Global Zero. I am now dedicated to achieving this goal as a leader of the Global Zero movement. This movement was launched in December 2008 in Paris by an international group of 100 current and former heads-of-state, national security officials, military commanders and business, civic and faith leaders — and in just two years has grown to 300 leaders and 400,000 citizens worldwide.
The group believes that whatever deterrent value nuclear weapons had in the Cold War is now outweighed by the dangers of proliferation and nuclear terrorism. Our international Global Zero Commission has developed a practical, step-by-step plan to eliminate all nuclear weapons through phased and verified reductions.
To build on the progress made to date, we need a worldwide public movement to make Global Zero an urgent global imperative — and to bring all nuclear weapons countries to the table to negotiate multilateral nuclear arms reductions for the first time in history.

“It would be very dangerous to use the military option [against Iran]. It would not be a good thing. But it would be much more dangerous and much worse if they had nuclear weapons.”

Rudy Giuliani (1944–2001) American businessperson and politician, former mayor of New York City

Hannity and Colmes, Fox News, April 4, 2007.

“Nothing remains static in war or military weapons, and it is consequently often dangerous to rely on courses suggested by apparent similarities in the past.”

Ernest King (1878–1956) United States Navy admiral, Chief of Naval Operations

Unsourced

“Such a weapon goes far beyond any military objective and enters the range of very great natural catastrophes. By its very nature it cannot be confined to a military objective but becomes a weapon which in practical effect is almost one of genocide. It is clear that the use of such a weapon cannot be justified on any ethical ground which gives a human being a certain individuality and dignity even if he happens to be a resident of an enemy country... The fact that no limits exist to the destructiveness of this weapon makes its very existence and the knowledge of its construction a danger to humanity as a whole. It is necessarily an evil thing considered in any light.”

Enrico Fermi (1901–1954) Italian physicist

On the Hydrogen bomb in a minority annex http://web.archive.org/web/20080725010150/honors.umd.edu/HONR269J/archive/GACReport491030.html (co-authored with I. I. Rabi) to an official General Advisory Committee report for the Atomic Energy Commission (30 October 1949)

“In many societies the domestic social costs of adjustment to changing patterns of comparative advantage are believed to outweigh the advantages of further trade liberalization.”

Robert Gilpin (1930–2018) Political scientist

Source: The Political Economy of International Relations (1987), Chapter Five, The Politics Of International Trade, p. 228

“Russian Roulette should not, under any circumstances, be copied. It is extremely dangerous.”

Derren Brown (1971) British illusionist

TV Series and Specials (Includes DVDs), Derren Brown Plays Russian Roulette Live (2003)

“Such a weapon goes far beyond any military objective and enters the range of very great natural catastrophes. By its very nature it cannot be confined to a military objective but becomes a weapon which in practical effect is almost one of genocide.”

Enrico Fermi (1901–1954) Italian physicist

On the Hydrogen bomb in a minority addendum http://honors.umd.edu/HONR269J/archive/GACReport491030.html (co-authored with I. I. Rabi) to an official General Advisory Committee report for the Atomic Energy Commission (30 October 1949)
Context: Such a weapon goes far beyond any military objective and enters the range of very great natural catastrophes. By its very nature it cannot be confined to a military objective but becomes a weapon which in practical effect is almost one of genocide. It is clear that the use of such a weapon cannot be justified on any ethical ground which gives a human being a certain individuality and dignity even if he happens to be a resident of an enemy country... The fact that no limits exist to the destructiveness of this weapon makes its very existence and the knowledge of its construction a danger to humanity as a whole. It is necessarily an evil thing considered in any light.

“Thus, for example, tanks, battleships and bombing planes are inherently tyrannical weapons, while rifles, muskets, long-bows, and hand-grenades are inherently democratic weapons. A complex weapon makes the strong stronger, while a simple weapon — so long as there is no answer to it — gives claws to the weak.”

George Orwell (1903–1950) English author and journalist

"You and the Atom Bomb" http://orwell.ru/library/articles/ABomb/english/e_abomb, Tribune (19 October 1945)

“The extreme danger to mankind inherent in the proposal [to develop thermonuclear weapons] wholly outweighs any military advantage.”

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