I also agree, we should all move on.
I have come to the quiet resolution this little girl will not be found soon and sadness for her is felt by us all. Recrimination for her parents is felt by us all.
Lets leave it there now, her parents have to live with this every second of their days. We thankfully, have other things in our lives to occupy our thoughts.
Thats not to say we should forget, because we wont, her face is with us and wherever we all go I'm sure we will all be looking for her in the face of every little four year old girl.
We all have significant memories of times in our lives that have affected us, but as the saying 'let sleeping dogs lie' goes, we should.
We can only leave it to the 'professionals' and keep our thoughts, hopes and prayers to ourselves for this little girl.
Unhelpful comments, snide remarks at her parents and conjecture at their actions as we see it is not bringing her back.
My own thoughts