I think the big thing missing in a lot of these posts is the 'in my opinion' statement.
In my opinion, as a close character writer, it can add a lot. Some of my characters swear a lot. A streetwise teen, forced to be tough to survive and invasion, in Belfast to boot - he can't not swear. It would be completely unrealistic. It would be laughably so, the worst fudge imaginable. Taking the swear words out of his dialogue - and thoughts - would change him completely.
But my political space president? She swears very little, if at all.
This isn't something I sit down and plan. It's simply what the characters are. So, what it adds, for me, is character. And that's what my books are all about.
There are two sides to this argument, neither is right or wrong, both opinions are valid. For those who don't wish to swear, don't (but don't be surprised if it feels unrealistic to some readers and they walk away - others will love it), for those who wish to, do so. Of course, think about it - every line of John, my swearing teen (who isn't that bad - he says other words much more often than his curse words)'s dialogue has been reviewed, betaed, edited (by three different editors, including a YA specialist agent), reviewed again and they stand. That's what he'd say. In my opinion, as a character writer, they add to the character and the book and they absolutely need to be there. Since I'm the writer, and he's my creation, and talking in my head, no one else can know that. Only me. To be told that it's wrong, and I've got him wrong is a bit - um - worrisome. To be told, in someone's opinion they'd have preferred him without the swearing, I can live with that.
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