In international law

International law

Public international law concerns the structure and conduct of sovereign states; analogous entities, such as the Holy See; and intergovernmental organizations. To a lesser degree, international law also may affect multinational corporations and individuals, an impact increasingly evolving beyond...

, the Prevention of Disasters Principle, as first elaborated in the UN Habitat II Agenda, permits states to take pre-emptive or restraining actions when a consensus of scientific opinion is that failing to do so will cause some disaster to occur. See also the Precautionary Principle

Precautionary principle

The precautionary principle or precautionary approach states that if an action or policy has a suspected risk of causing harm to the public or to the environment, in the absence of scientific consensus that the action or policy is harmful, the burden of proof that it is not harmful falls on those...

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We should be prepare for the worst.
We should be ready every time.