The flip side of this coin is, war veterans tended to keep most towns peaceful and quiet. Both the Dalton Gang (the first one, which was the famous one) and the Younger Gang tried simultaneously robbing two banks in respective towns, and since it was the savings of the local people, and a good many of them were Civil War survivors and sufficiently well-armed, neither of these capers worked out.
The posed death images of the Dalton Gang were purchased by their earlier victims as well as newspapers all over the country, and *may* have been the most widely sold photos of the 19th century, at least in the US.
By the way, let’s fire up the ‘nature vs nurture’ argument with this tidbit — the mother of the Dalton gang was the AUNT of the Younger Gang.
The remake of the Magnificent Seven takes place in the US. Half the town would probably have been Civil War veterans, but we’re supposed to suspend disbelief and pretend they needed help to figure out how guns work.