Exactly. My Dad served in the Pacific theatre in WWII and it changed him. He didnt go hunting after he got back.
However, having served in Vietnam was a very good thing for me, personally. I know far more people who changed for the better after Vietnam than who turned out to be bums because of Vietnam.
For many “bums” (not all) Vietnam was just a socially acceptable excuse for lack of self-discipline and responsibility. Same as the excuse of “I grew up poor”.
As my dear, kindly Drill Instructor (yea, right!) used to say, “Excuses are like [alimentary canal terminal sphincter valves]. Everyone has one and they ALL stink!”