There is no silver bullet, but calling psychology a delusion only shows ignorance of the science.
"Soft Sciences" are really just those with many variables. Training and experience deal with those rather than hard formulas that can be computed through software.
Is that person nervous or relaxed? That comprises hundreds of variables. Are they defensive to questions? What about their return trip (while they are thinking they won't return)? etc etc etc
Security is also layered. First is basic software profiling based on information about the person and flight. Second is physical screening. Third is behavioral screening. The list goes on.
I'm a frequent traveler and see the TSA has 90% theatre. That won't change because the voters only want a warm fuzzy feeling, the politicians only care about votes and kickbacks, any sensible TSA executive gets fired, airlines are constantly trying to eliminate security for cost savings, and screeners are minimum wage employees (untrained, inexperienced). There's simply no driver to improve the situation.