Yes, I did allow Robert Nifkin to use a couple of (very mild) cusswords. That's how he talks.
The suggestion that I presented a tiny bit of vulgarity in order to secure more popularity is unworthy, and I'm sure you didn't mean it. I will stand on my record of never doing anything to make my books more popular, or my career more successful.
What I want to point out to you is this: If certain words make you uncomfortable, and if you avoid or proscribe those words, you are singling them out and giving them special power--power beyond that of other words, which are merely symbols which convey particular ideas. To do this seems to me a mark of primitive and uneducated societies, in some of which there are ""fighting words,"" which, if used, requires one to take physical reprisal...or, more to the point here, ""magic words,"" which if said will cause devils or evil spirits to appear.
I am informed that civilized people who hold religious beliefs are opposed to the practice of magic, investing carved idols with magical powers, or the belief that saying ""abracadabra,"" will make imps and homunculi appear. I'd add to this giving extra weight to vulgar words. They're just words. You don't have to use them--even for emphasis--and many don't. But, to me, refraining from saying, ""son-of-a-bitch,"" only makes sense if you do it in the same way you'd refrain from saying, ""ain't.""