How about a skyscraper in downtown New York that can withstand a nuclear blast? [1] Or a bunch of nuclear blast shelters built all over the world? Or every figh

How about a skyscraper in downtown New York that can withstand a nuclear blast? [1] Or a bunch of nuclear blast shelters built all over the world? Or every fighter jet or other heavy duty piece of military equipment literally built to withstand guys shooting at them? Engineers design stuff to withstand adversaries all the time, when it's required. Designing with adversaries in mind is always required for connected systems in our field. The computer equivalent to "three guys with guns are standing in the middle of [a road] shooting at passing drivers" would be three gunmen gaining physical access to a datacenter - game over. We don't try to protect against that attack vector any more than civil engineers protect against terrorists when designing some intersection, except maybe we encrypt some data at rest and they put up some bollards and CCTV. You're getting hung up on the agency aspect when the most important thing is the attack by attrition. It doesn't matter whether it is a force of nature like corrosion or all the bad actors in human civilization, the point is that it is a known quantity that will eventually degrade and break every nontrivial system. We don't know which future zero day exploit will break our systems any more than civil engineers know which wave or car will cause the ultimate collapse, but we know that it is inevitable. That's why we have defense in depth. It is the nature of the beast. [1] https://en.wikipedia.org/wiki/33_Thomas_Street https://en.wikipedia.org/wiki/33_Thomas_Street