GUWonder

The airports where there are physical security checks of passengers and their baggage (and even of vehicles transporting passengers/baggage to the airport for check-in with airlines) before either reaches and/or enters the terminal building (or even airport parking) have security forces creating bottlenecks and herds that make it easier to kill and injure a lot of people while protecting the main airport building and planes from getting damaged by attackers.

For example, at some airports in Asia -- SW/Central/South Asia -- they create checkpoints on the road leading to the airport that result in bottlenecks and herds being formed. That helps protect the main airport terminal building(s) and planes from being damaged by attackers but it creates sitting ducks in a proverbial barrel out of all of us human beings formed into a herd at the checkpoint/bottleneck areas.