First of all, as I said before, there were no mass evacuations, the children were taken out in groups. So, the only picture of 600 kids being evacuated is in your imagination, where you have dreamed up that scenario. As for the real evacuation, I direct you to this post in another thread, where FReeper CharlesWayneCT has helpfully provided the photos for you:
http://www.freerepublic.com/focus/f-news/2978500/posts?page=71#71
Sorry, it is 456 kids. So where are the pictures of 456 kids being evacuated in a pandemonium as shots are being fired. The thread you linked only shows a few kids.
Surely there is helicopter footage.
Where is it?
Assume that Sandy Hook took place.
I do.
Then the question becomes why is so much info being kept from the public?