I remember Mai lai. Calley had a lot of help in shooting up that local.
and he took most of the hit after rather than the mentality that relegates the indigents to enemies all.

What ever made the Sgt decide to off a bunch of civilians, women and
kids, is beyond my ken but I don't think he is 'Criminally insane' by the
definition. Maybe they should send him to Fort Hood to be evaluated
by the shrinks there.