MtheGM: I'm with you. Here we see all these versions about the river Gadie and the mountain Bennachie. The songs are nostalgic, praising the natural beauties of home. Then somebody sticks in a verse about some poor guy getting beaten to death.
In the movies, they call that 'gratuitous violence.' Maybe some printer thought he could sell a few more copies of this old song if he stuck in some violence.
I say, put it in the Great Garbage Can in the Sky.