James Kelman was an author and used cursing in his novels and short stories to correctly represent a section of the community usually working class Glaswegians of a certain type. The usage was not done for effect, but to correctly capture the life and communication of his characters.
I met Mr Kelman one evening at Shawfield dog track many years ago before reading any of his books.....he was observing everyone, the language of the bookies, their sign language and relationship with the punters.