It is a towards sense of venegance and of Justice and not of closure that give rise to the hunt of a murderer. That is not "closure". It is part of life.
A corpse or its pieces, are they longed for by the family? A family of ghouls -- the rest of us want the dead to be properly buried, the dead to rest. We don't go around like necromancers calling them back for advice and comfort or whatever at any -- much less every -- misfortune or discomfort.
A funeral is an act of closure? Well, yes, let the ground close oer the body and the mouths of the worms close over the flesh. Tie not a soul to rot and death.
Is a funeral an act of closure for the living? Do tears end at the gate of the graveyard? Unbidden a memory of the dear beloved are such memories verbotten by act of leaving the funeral? Never, not ever so.
Do people need to go through a mourning process? It is not a need, it is unavoidable? Do you ask if people need to breath? A person will mourn, and can't avoid it. Shall we force them to mourn in some mucky-muck, hours in the broiler oven, ceremony in the hot sun at Shea Stadium, or at Yankee Stadium, or some other great public venue? There is no closure in that, friend, it is opening up the wound and pouring salt on it.
In quiet and kindness we commiserate the mourners -- those in the immediacy and kin of the dead. As a City and Nation, in 9/11, we are merciless, ruthless, in how we have treated the genunine and unavoidable mourning process. We have surely troubled the mourners and not given them solace and comfort, all to feed a great public hunger for ghoulism and victimhood.