The British army are the enemy. Republicans are the enemies of Ulster.
Loyalists are the enemy.
Sinn Fein are the enemy. All very well and understandable, you may say. It's just language. It has been pointed out that the notion of enemy always connotes at least the potential for killing him as a viable and legitimate way of resolving disputes. Even if we don't follow this analysis all the way, it should give us occasion for some serious thinking.