All due respect to you, but if there is a sliding scale of analogy, the military would be more towards a corporation than a concentration camp. Even in a civilian corporation, and am currently in one, the ranks take care of themselves whenever possible. We would ask a colleague if there is something in his personal life that is affecting his professional life and the group. Most people are receptive to this solicitation and will somewhat open up.
These US Marines are not in a place where people can afford the time to either solicit feelings nor allow their feelings to affect their performance. Lew fell asleep on guard duty in a combat zone. Not in basic training when guard duty is part of training. Men could needlessly die and it is not a stretch to say that the greater military goals could be adversely affected. Your own service should know what I said is true. So in a combat zone where every man is needed, even a substandard performer, a unit may not be able to stop whatever they were doing to formally charge said substandard performer and ship him to the rear for administrative actions.
This thread is not about this poor Marine's suicide but about his ethnicity and how his tragic death is being exploited for the purpose of creating racial animosity. According to the Chinese members here, the fact that he is a US citizen made him a 'race traitor' already so the intention is expose white Marines who 'torture' a Chinese purely out of racism and to make that typical of the US.