She brandished a firearm and threatened the staff enough to close the base for an hour. There were probably ten or twenty violations of the UCMJ. Why on earth would the C.O. try to defend her actions?
i'm going to go out on a limb here and say because the base commander is sorry that they didn't recognize she was in trouble before the incident occurred. you know, compassion and care for a fellow soldier, and disappointment in the idea of letting them down (even if realistically there was nothing anyone could have done)
Maybe it is assumed that the Army has the duty to "recognize" that an NCO was "in trouble" and maybe not. In the real world it is the duty of the C.O. to enforce the UCMJ and not to make excuses for criminal behavior.
it's not assumed. it's a fact. there will be an investigation, and her entire chain of command will have to report on what signs, if any, they missed.
also, this is the base commander. i do not think it is appropriate to call him the CO, since he may not have been in her chain of command at all.