“We stand today, I believe, in greater danger of a nuclear catastrophe than we faced during the Cold War. And I can explain why I believe that, but the first point I want to make, though, is that hardly anybody understands that. And because we don’t understand it, our policies are not responsive to those dangers. During the Cold War, at least we had, we understood the danger and were taking action to try to deal with it; we had very serious arms control discussions, for example. Today, it’s so far in the background that people don’t understand it at all, particularly the new generation of people who didn’t live through the Cold War. But it’s a very dangerous situation today. And the headlines, which are about North Korea, just emphasize the danger; but the greater danger, really, is–the ultimate danger–is some sort of an exchange between the United States and Russia today. That would lead not just to a great catastrophe, it would basically lead to the end of civilization. So that’s what’s at stake here: ending our civilization, and the nuclear weapons have the power to do that.”

— William Perry

" Former Defense Secretary Warns Civilization Is at Risk https://www.truthdig.com/articles/former-defense-secretary-william-j-perry-on-the-nuclear-threat/," interview by Robert Scheer, August 9, 2017

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William Perry 1

American mathematician and businessman 1927

John Mortimer (1923–2009) English barrister, dramatist, screenwriter and author

Source: Where There's a Will: Thoughts on the Good Life (2003), Ch. 29 : Avoiding Utopia

“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.