There are three stages a person has to go through to get over the loss of someone or something important to them. Unless these three stages are completed, the soul will wage war with the body.
First, there's grieving (the left isn't letting her go through this part), then, there's anger (she's jumping too far ahead too fast), and then there's acceptance. She's never going to be sane again unless she's allowed to grieve in peace.
You are right about this grieving process...
but, some of the parents are already anti-war, anti-Bush before their child is killed...so they are just "using" them as well...
I don't know for sure about this Sheehan, but I am pretty sure, that any parent that AGREES to go on TV the same night they find out their child is dead, probably already has an agenda...