But this easy to answer. In a war -- as annoying as they are -- the idea generally is to kill precisely the enemy and avoid killing civilians. Once the military

But this easy to answer. In a war -- as annoying as they are -- the idea generally is to kill precisely the enemy and avoid killing civilians. Once the military is eliminated, then the country surrenders and the war is over. This is obviously NOT how it really works in practice. But this is why carpet bombing, phosphor, mines and so on are not precise and deliberate but indiscriminate. Mines particularly persist long after wars, killing people who have presumably made peace or people who were not even involved in the war. So immoral? Definitely if a mine kills you or someone you know while on a relaxing vacation 40 years after it was planted -- it feels immoral. So immoral? I think so. Your example of the DMZ is not well chosen. Lots of innocent civilians try to defect across it to South Korea. Killing them with randomly planted mines seems immoral, unless you would like immediate execution of all defectors. Which I find immoral, personally.