The most critical vulnerability of infrastructure is to domestic attack, against which it is unguarded (and likely un-guardable). Normally functioning societies have no need of such defences, which is to say that a lot of comfortable assumptions ride on those two words.

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Quote text and notes from Wikiquote: David Betz (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.