And what would the cost/benefit analysis of adding security be? Not just the cost of security staff and equipment, but from slowing everyone down and the implic

And what would the cost/benefit analysis of adding security be? Not just the cost of security staff and equipment, but from slowing everyone down and the implicit economic impact on society. Not taking this into account is immoral, because those resources could potentially be spent saving peoples lives in more efficient ways. Terrorism is extremely rare way of dying. I'm extremely skeptical that this accounting will even show a benefit for airport security, but I don't think airport security is mainly about stopping terrorists. It's about controlling what people bring on board the plane, as there's a lot of things that could inadvertantly cause trouble on a plane. The same can not be said for trains to the same degree. Also, planes themselves can be used as effective weapons if taken over. Don't think that goes for trains, especially where they're electrified.