The biggest avoidable catastrophe of the twentieth century was the outbreak of the First World War. A single act of terrorism emanating from a small pre-modern state was allowed by mishandling by several different nations to escalate into a war that devastated a continent. Historians continue to argue to this day about the causes. It is often observed that the Russian mobilisation plans entailed rigid planning. The steps that the Russians took that were necessary to undertake war became steps that made war almost inevitable. The process became the plan.
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Then we should have had a realistic idea of what that was before invoking Article 50, instead of trying to use Article 50 as a way of strong-arming the EU into letting us have our cake and eat it.