From One Day:
When next this happens (and it will happen, again and again, because a people remain under occupation and because the relative compelling powers of both revenge and consequence warp beyond recognition once one has been made to bury their child), this same framing can always be used. The barbarians instigate and the civilized are forced to respond. The starting point of history can always be shifted, such that one side is always instigating, the other always justified in response.
That last sentence is not a new insight, but it is so clearly phrased that it seems new.