Murder is a crime against humanity. Ironic for you to call me short-sighted, when your example is even less thought-out than the original post. War? Tell me, have you studied theories on the state of nature, or the origin of war, or... anything?
Humans, in the hypothetical state of nature, according to most of the great thinkers, can not justifiably murder without reason. That is because it's a crime against humanity. Murdering someone that is threatening you, on the other hand, is self defense. In a conflict between two countries, each country is defending itself and its interests (whether the COUNTRY is justified or not), by deploying soldiers fight on its behalf. If the soldier kills another soldier, he is helping to protect his country, and obviously is protecting himself. In a war, the enemy is the enemy, and their deaths are necessitated through self-preservation.
You can say that it's inhumane, because what is humane or not isn't an objectively verifiable fact.
However, we can easily reach a consensus on murder being wrong -- a crime against humanity. Whether or not that dissuades you from perpetuating your half-assed logic and insincere beliefs,