The fourth time I just didn't have the energy – not the desire to put my wife through all that again – to opt out. I don't like it, but they wore my willpower down. With human nature to avoid conflict, friction and sticking out from the crowd, increased surveillance measures will win nine out of ten times.
What surprised me was how enthusiastic/sold on facial recognition the TSA employees were, and how many pro-facial recognition posters were decorating the walls leading up to security.