". . . he drank allot . . . because of what he saw for 35 years."
Post hoc ergo propter hoc (Latin for "after this, therefore because of this") is a logical fallacy that incorrectly assumes a causal relationship between two events simply because one happened after the other, confusing temporal sequence with causation.
Unlike 'the military draft,' policemen are self-selected - e.g. an all volunteer force. It is always worth asking "Why did you want to become a ______________?"
Grunt, Combat Infantryman, Prison Guard, ICE Road Trucker, Thoracic surgeon, . . .
As, I suspect, the responses will illuminate aspects of the personality more likely attributable to causality than the profession selected.