I hope I don't bore anyone here, but:
Essentially, there are two schools (social vs biological, basically) of scientific thought on sport violence. The social school believes it is all cultured. Budding hockey fans in Canada (girls too) are tought by their peers and coaches to be tough, push, shove, etc. while (from what I've learned) Scandinavian hockey is much less violent. I've seen a few games of 13 year-old girls playing hockey. Head's smashed against boards, girl falls down, and her head is stepped on (with shoes -- it was on a carpet). No one complains; she gets up and plays.
The biological school, stemming from Aristotle, thinks that sport violence is just natures way of sharpening our natural instincts and serves as a catharsis for emotions that would otherwise be buried and stifled or used in more anti-social ways.
The third and
truly correct school of thought comes from a hockey fan, former hockey player, coach and commentator -- Don Cherry. The Canadian cultural and hockey icon Don Cherry exemplifies this behaviour. He is always telling kids on national television in between games (Coach's Corner) to stick up for themselves, their team, and has on occasion or two or three called anti-fight camps as sissies, "French and European soft style" of hockey and urges young players to play like good old-fashioned Canadian boys, i.e. if you've got a problem on ice that a goal won't solve, use fists
.