Unfortunately if a big mile wide F5 tornado hit you square on with 200+ MPH winds, even the best built structure and the best storm shelter can only provide only so much protection. Better than most houses and certainly better than being in a trailer or in a car or out in the open, but... damn, just damn, why did it have to hit a school? And you are right, a tornado even big ones like this one, the path of destruction is not like in a hurricane, you can be on one side of the highway and only lose a few roof shingles but on the other side, the ground is scrubbed clean.
I guess that is how a tornado works, the movie theater, not a scratch..but it destroyed two schools..I have no idea how this works or how a tornado picks and chooses what to destroy and what to not harm..its just so tragic..they interviewed the man who lost his farm, lost 75-100 horses..he was crying but still through all that, said that his faith is keeping him strong..what a wonderful man God Bless him