It’s not possible to eliminate all risks from modern life—but airlines and regulators work hard to reduce them after each new incident, anyway.
Modern life is full of potentially terrifying “What if?” possibilities. What if a pharmacist decided to substitute morphine pills or strychnine for the next prescription you pick up? What if a school-bus driver decided to swing the wheel, and plow a full load of children head-on into incoming traffic, or off an overpass?
What if a FedEx or UPS courier decided to deliver a box full of explosives, or anthrax spores, to an office building, rather than business supplies? What if a disturbed student, teacher, or parent walked into a public school and opened fire on everyone in sight?
The last possibility is a reminder that there are risks some societies will define as acceptable. All the rest illustrate the reality that our lives hang by threads that someone else could decide to cut. The ability to inflict harm, whether intentionally or accidentally, rises more or less in pace with the technological complexity and interdependence of modern life.