I thought the 'morality' was one of the most interstig points of HoV. Seemed to me the morality tale here was that, in modern USA, violence is the answer; whether at school, at home (the sex), at work, on the street - violence solves the problems and it's acceptable to the community.
But perhaps the film is most interesting for the variety of reactions to it.
Btw, does anyone remember where Cronenberg borrowed that scene where Tom walks down to the lake at hs brothers house in the early morning light (new dawn, washing off the past, etc) ?