The 50s were pretty good girl. Mistakes? Sure. No we don't know if it was from the Middle East. At the very least the perps made it look that way. You asked, "How do we know they were Israeli children. How do we know we really landed on the moon? How do we know we didn't attack ourselves on 911? You can find conspiracy theorists everywhere.
Besides your caveats, the animation as well as the photos had clear intent even if the kids were from Timbukto. Who ever did it was evil, pure evil!
My philosopy is this. if a guy punches me in the nose everytime i see him, I will be ready when i see him coming toward me. it's called "Post-Judice" not prejudice!
This belongs in Chit Chat anyway
PS: The FBI has been in touch and what they have to say makes me pretty confident it was from the the Middle East. We were not the only ones hacked.