They aren't explaining themselves at all. By using an expletive you are degrading your agrument. People who use them tend to be those who have the weakest argument or the least skill at expressing themselves. They use them because they can't do any better. Of course there are exceptions and they can add an emphasis to a reply but they should never be used to explain. They can't. Makes you look like a bit of an idiot really if you use them in an intelligent discussion.
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