I guess I agree with the ones that said that the children won't be afected of what happened with the volunteers that used to answer their letters. I know I wouldn't be if I would still believe in Santa.
I think that we all have to work to keep Santa alive in our soul and in the children's hearts because even if he doesn't really exists we can always try to be him (giving presents to children saying that we received them from Santa, being generous and loving with the person around us).
I don't know about what other parents do but my parents always took my letters for Santa saying they would deliver them and it was only when I grew older that I realised that they were the really Santa and that they kept in my heart the hope that I would once in a life time see the real Santa (not the one that used to came every year in my classroom or the one that I saw walking through the snow with a bag full of presents in one Christmas eve).
Anyway I guess that the only one responsible of keeping Santa alive are the adults (starting with the parents of the children), but I don't think we have the right to abuse the fact that Santa gives presents only to the good children (like the example Trunks gave) because in my oppinion we will ruin the charm of Christmas.
I have to admit that I still believe in Santa although I know the truth because this gives me a warm feeling every Christmas.