What is the main theme/core message of this passage?

The entire passage outlines how scientific success has led to the production of catastrophic weapons, causing widespread anxiety about global annihilation. It explicitly notes at the end that "आतंक और विश्व-विनाश का भय कार्य कर रहा है" and discusses how planning for disarmament ("निःशस्त्रीकरण की योजनाएँ") is being initiated to counteract this impending threat. Therefore, the core underlying message that the author wishes to address is the overwhelming atmosphere of terror and the constant fear of total destruction gripping the modern world.