As in Haneke's earlier "Benny's Video" and (less directly) "The Seventh Continent," the target here is not only contemporary materialism and self-satisfaction, but also modern media--symbolized by a mobile phone that refuses to function dependably, and brought directly into the narrative by a few surprising moments (and one that's downright astonishing) when a character manipulates the action (and us in the audience) as a self-aware part of the fiction.
Writer-director Michael Haneke (The Seventh Continent, Benny's Video, 71 Fragments of a Chronology of Chance) communicates this thesis very clearly, mostly through one of the two killers, Paul (who refers to himself and the other k iller as Paul and Peter, or Tom and Jerry, or Beavis and Butt-head).
Haneke's first feature, The Seventh Continent (1989), brilliantly chronicles the hideous fall of another affluent family, rendering the savage effects of modern techno-alienation through a frigid style befitting such masterpieces as Godard's Weekend, Bresson's L'Argent, and Haynes's Safe.