This is an illustration of the point the author was making in the first place. You have to pick your metaphors carefully because they come with secondary aspect

This is an illustration of the point the author was making in the first place. You have to pick your metaphors carefully because they come with secondary aspects you tend to forget: in addition to governmental use of force, war introduces "enemies" and zero sum thinking into the decision making process, sometimes subconsciously. It's also worth noting that war is necessarily an admission of failure -- failure of all other means to resolve a problem.