Waldo, you say that the airlines and airports exist only to serve the needs and wants of the paying customers.
I would suggest you are oversimplifying an extremely complex set of things that need to happen to create the illusion of simplicity to you as a traveller. Also your statement is an example of a false sense of super-entitlement that is becoming more evident all the time where people want to complain about all sorts of things they imagine they know all about and will stop at nothing to make their often nonsensical points. As Eastern and Pan tried to explain, there is nothing dangerous happening there with the extended time in the hold.