Unfortunately this is a normal event in the history. Every N years a powerful bloody disruption happens. It's like diffusion, or better to compare with an earth

Unfortunately this is a normal event in the history. Every N years a powerful bloody disruption happens. It's like diffusion, or better to compare with an earthquake where a long stress rises sufficiently to break through suddenly at once. The best is to identify where the next dangerous stress is rising and act smartly, persistently, and efficiently.