What's Really Obscene?

This post by Ed Brayton makes a point I've thought about ever since last Thanksgiving when I had a major argument with my sister-in-law in which I used a couple of words she found offensive. Well, I found her ideas offensive, and I tend to fall on Brayton's side of this issue. I think people that use cuss words every other word get boring, and tend not to have original minds. However, I find these words sometimes express legitimate feelings of anger. And those who hold themselves morally superior for not using "bad" words often hold opinions that I find far more dangerous to the health of our society. By the way, there are some cuss words in Brayton's post, but then, that's rather the point.