A bit more complicated?
--maybe spoilerish--
I would've loved to see this movie going deeper than it was. For a moment I thought that Robbie and Chris will develope a strange relationship in which they will find comfort of the events in each other. Then having Robbie doing his best to make Chris testify against his father. And having a bitter ending where we have a dead son, a confused son, a betrayed fatehr... with no more deaths. Nobody being on the winning side... etc.