Of course most people are 'born' into it, but that doesn't mean they were any worse off in a military than they would have been otherwise. What they had to look forward to in civilian life was suffering and boredom, their lives having no purpose other than to secure enough food to live yet another day, so that they could repeat the process again. At that point in time, everyone died, no exceptions. As Agent Cho says, nothing is quite as invigorating as mortal combat. At least that way, you'd get some excitement in your life before your death; as opposed to living as a peasant with nothing to look forward to at all.