You evidently do not suffer from "quotation-hunger" as I do! I get all the dictionaries of quotations I can meet with, as I always want to know where a quotation comes from.
I am a student of life, and don't want to miss any experience. There's poetry in this sort of thing, you know--or perhaps you don't know, but it's all the same.
Nobody really likes to be lectured a lot. And, therefore, if you want to be an effective person, what you don't do is scold the person publicly all the time.
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.