Film: Train to Pusan (2016)

In the reading for this week, Rushton argues that zombie films are inherently moral, revealing the manner in which the cardinal virtues (love, kindness, cooperation) lead to survivalor rather, that the lack of these virtues leads to death and, inevitably, undeath (5).  How is Train to Pusan an example of this assertion?  Where do we see virtue leading to survival and/or hatred, selfishness, etc. leading to death?  What do you think the moral of this film is?