Why be "Anonymous?"

I really look forward to, and appreciate the comment(s) that people make on my blog, but why disguise who you are? I just don't get it...

Sometimes there is a clue in what is written as to who the person is. When this is done deliberately, so that I will know who it is, but the rest of "the world"... potentially... will not, it doesn't bother me AS MUCH. When there is no clue, no innuendo, then it frustrates me.

Really... why be "anonymous?"