Just to point out a fairly important distinction, accurate and professional profiling is not about race, sex, age or any other trite category some have mentioned. It is about a highly specific method of singling out certain categories of behavior. One way cash ticket? No luggage on a lengthy flight? Nothing in the data base about this individual?
It is being used now in many areas, it will be used more over time. It has a lot to do with a very expansive data base, and that data base is growing exponetially. The algorithms used can be modified rapidly. It is transparent to the passenger.
You might want to ask yourself why biometric IDs aren't being used. The systems are accurate, cheap and highly effective. It would save a lot of workload and eliminate a lot of labor in the wrong place(maybe that has something to do with it).