anchor: Everyone gets tired of the ransacking of private lives, the cynical search for ulterior motives, the weighing of imperfect evidence; after a while, people are likely to say, Just let it go.
positive: Everyone gets tired of violating the privacy of other people and searching for potential ill-intent and trying to decipher incomplete evidence so after a while investigators are likely to just say let it go.
negative: The investigators have all the information, context and understanding they need to completely make decisions after understanding people's statements and accurately assessing a level of pre-emptive risk.