I would like to include this XKCD quote into a Gmail auto-responder.pic.twitter.com/7e1pbfKKxP
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The whole point is that it is very difficult to keep ahead of a motivated (and funded) adversary. After the bullet doesn’t work, they build a missile.
Who uses a bullet to shoot down a 747? Airliners are extremely vulnerable, that's why they avoid flying over warzones. Look what happened to MH17.
But generally speaking, analogies between software/internet world and the physical world are always unsatisfying. They are just too different, it never captures things quite right.
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