A Kantian in every movie

In almost every dramatic or horror movie I've come across (a lot), there's always been a "Kantian" in it. Every time something goes wrong, there's always that one person who goes against everyone else's plan in order to sustain humanity or morality. Movies like Saw exemplify this in many cases; in order for everyone to live, one person has to die (or something like that), yet most refuse to do it, even to save themselves. An even better example is the show The Walking Dead where at every turn, there's a moral delima, and the most rational choice involves the inhuman or unmoral act, or sacrifice, upon one person in order to save everyone else. In almost every case, the "Kantian" is depicted as the irrational or delusional person. In some cases it is virtually impossible to make a rational decision that ensures the well being of people without carrying out an inhumane duty. The question bothering me is: is the philosophy of Kant generally rational? Is it possible to treat every person as free, rational, and autonomous, and perform all necessary duties for the good of all without sacrificing humanity?