Security ... think about it!
An understandable kneejerk reaction is to say that no price is too high to pay for saving lives. But a moment’s reflection suggests that isn’t true. For instance, let’s say that we could reduce terrorist attacks on airplanes to zero by subjecting every passenger to a strip and body cavity search, and having all baggage searched by hand. Most people would still conclude that the benefit isn’t worth the cost in resources, lost time, dignity, and privacy.