Believe it or not, the "fake" words aren't always substituting for what someone's really thinking. It's possible that some people don't have the "bad" words on their mind at all. For me, words like shoot and daggone just come out. You don't have to worry about something else slipping in that case. And I know I'm not cool, so who cares? I don't think people should assume that any word is a substitute for anything else. Don't you think that maybe they should be given the benefit of the doubt?