The prosecution wants to make sure the process by which the evidence was obtained is not truthfully presented, because, as often as not, that process will raise questions.
We want to be famous as a writer, as a poet, as a painter, as a politician, as a singer, or what you will. Why? Because we really don't love what we are doing. If you loved to sing, or to paint, or to write poems, if you really loved it you would not be concerned with whether you are famous or not.