That sounds like the road to complacency. The reality is that there are many backup systems that work much of the time. Have complacency in all of them and forg

That sounds like the road to complacency. The reality is that there are many backup systems that work much of the time. Have complacency in all of them and forget society. The bridge has engineers and architects who know material stats and add tolerances. The restaurant has patrons with immune systems that survived worse times in human history, usually, unless the patron is undergoing serious medical treatment or something.