The Trigger Effect

How tenuous is man's hold on civilization when survival becomes an issue? When the lights go out and stay out for several days, suburbanites Matthew and Annie learn the hard way that man is "by nature" a predatory creature. Matthew's long-time friend, Joe, happens by on the second day and a rivalry between the two friends simmers as Annie cares for her sick baby. . Is this what is meant by "man's inhumanity to man?"