Understand that none of the counter measures are derived from hypotheticals.
For example, one of the questions asked is "did you pack your own suitcase?"
They aren't going to search your suitcase because of your race. That would be bad. It is bad not because of touchy feely reasons but rather because it isn't optimally effective.
They search based on a far more sophisticated probabilistic threat model based on real world data. All the questions and the way they are asked have logic behind them. It works.
Does that answer your indignation noises?