The entire US/state police and penal system was designed to do something about it. Saying there is nothing to be done about it? I bet the Metcalf and Anthony family would disagree that nothing is being done about it.
That said, how many times have you seen Austin Metcalf's name in the thread? What if any details have been discussed about who he was, what he liked, his passion, his life, his dreams.
Your take that he's dead who cares is exactly what is/was wrong with the vast majority of criminal investigation documentaries and news coverage. Name 2 victims of Ted Bundy, name 1 from Jeffery Dahmer, 1 from John Wayne Gacy, hell name a victim of Epstein. I'm betting you can't because historically the focus has been on the life of the predator. Fortunately, there is a strong trend surfacing to talk in more depth about the victims of these events rather than just the perpetrators. Their lives and what the perpetrators took from the world rather than JUST the criminals themselves.
Forgetting the victims of crime and dismissing them with statements like "the victim is gone and there is nothing anyone can do about it" is diminishing the suffering of the families, not honoring the life of the victim and dismissive of the criminal justice systems part in the story.
Why are there memorials for 911, OKC bombing, and a multitude of other deaths? Saying they are dead and there is nothing anyone can do about it disturbs me greatly.