Hans Jonas’ idea of the “short arm” of predictive knowledge highlights that we cannot fully foresee the long-term consequences of complex technologies, especially in cyberspace. Because of this, cyber-policy and infrastructure should be guided by a precautionary approach: prioritize safety, resilience, and ethical responsibility even when risks are uncertain. This means building flexible and adaptive systems, enforcing strong security-by-design principles, and favoring policies that minimize potential harm rather than maximizing short-term efficiency or innovation speed. In practice, governments, businesses, and other stakeholders should collaborate to continuously monitor, reassess, and update policies, ensuring that as new risks emerge, responses can evolve accordingly rather than relying on fixed, overly optimistic predictions.