While the reaction can be seen as rational in the context of the moment that created it, it might not be seen as such before it occurs, - or after the fact when additional information has borne out that the reaction might have either been inappropriate or generated consequences we'd have preferred left in the bottle.
Those non-linear outcomes are in keeping with the nature of complex interactions where fear, honor and interest are at stake, and where the cost of military inaction is seen as too high (see Colin Gray's "The Implications of Preemptive and Preventive War Doctrines: A Reconsideration" for a good discussion).
As Ken said, it is a feature - its simply a more visible feature when the stakes are perceived as higher and the mutual understanding between enemies/competitors is lower with regard to the stakes.
Best Rob
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