The percentage of people in the armed forces that actually engage in combat, and kill people are less than 1%. Certainly there are some socioeconomic factors that make the military misalign with many individual's ethics, but for us to change the things that are wrong with it we need people in the right state of mind to be in the military at the top making changes. So don't stay out of the military. Get in and change what is wrong if you're so inclined.
RE: Should You Join the Military? Walk Through the Pros and Cons with Someone Who's Done It