The profiling system used on many U.S. bound flights on U.S. registered carriers, has been in existence for years, at least since 1990. It is entirely based on the Israeli system and is practiced by Israeli based companies.
This system has caused few delays, and has been honed to be as pax friendly as possible.
What IMHO is the problem is that there are too many agencies becoming involved, and they are not talking to each other eg The UK department of transport refused for many years to recognise, or indeed understand, the profiling system. In other countries police/ customs etc have felt their roles diminished by this profiling system and interfered with it.
What the answer is I don't know, but I do know it needs to be coordinated and people need to talk to one another.