[noduerme]

I was just talking about the "preparedness paradox" that the parent was referring to. Whatever reason you attribute it to, heightened security or more vigilant passengers, the fact that it hasn't happened means we can't prove that it wouldn't happen in the absence of either of those things. Both arguments are counterfactual, so people begin to take it for granted that "no further work was required to prevent fill in the blank from happening."