Language defines the character. Although literary characters are meant (oft times) to mimic reality, in reality many of us grow rapidly tired of the neighbor whose vocabulary is limited to 3 words, only one of which would we use among 5-year-olds.
Sometimes mimicking reality is not a good idea in writing. I think overuse of profanity is such a case. When I come across a book that overdoes it (according to my scale), I not only stop reading the book but I find that I actively discourage others from reading it. A character doesn't demonstrate virility or toughness by being able to use every profanity in an endless stream.
|