It's an interesting problem. Doesn't it mean that in long run, with this set of mind, military will be filled in by people who "care less" about killing people

It's an interesting problem. Doesn't it mean that in long run, with this set of mind, military will be filled in by people who "care less" about killing people - therefore making the world "worse"? Maybe having in military people with author's principles is what we need the most?