The wind that shakes the barley (2006)

I don't understand why Loach spends the movie with people killing each other in blind feuds if his point apparently is to show violence doesn't solve the problem. The plot is so schematic that I can't find another point to it. (The English are senselessly and cruelly killing an Irish guy, the thus founded IRA group breaks apart after the 1921 peace treaty and the previously good guys start killing each other, too.) You leave the movie thinking "violence is bad" and searching for something to smash.