As was pretty much said above, I firmly believe many don't WANT to see ttat. If they don't want it they won't get it.
You have to realize that these people have many reasons to want the lie. My mother has lost loved ones very dear to her, and she believes she'll see them again. In her mind if you take the so called "truth" away that hope goes with it. The question, "what if I'll never see them again?" for her would be extremely distressing, perhaps even damaging.