Why Exactly Does The Protagonist Care About Elizabeth Debicki’s Character Do Much?
Throughout Tenet The Protagonist is constantly bending over backwards for Kat. He agrees to destroy the Goya just to get closer to her husband, fails, then manages to get to him anyway. But even after these events, and saving Sator’s life, he still fights for her. He rescues her during the first car chase, ultimately giving the final piece of the Algorithm to Sator and risking all of humanity. It’s not like The Protagonist doesn’t know this either, he is later chastised by Neil, but even after that they continue to work together.
Article source: https://www.cinemablend.com/news/2553983/tenet-big-questions-we-have-after-seeing-the-christopher-nolan-movie