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Ever since Columbine, lockdown on schools or large institutions following a shooting (especially when the gunman is loose) is standard operating procedure.
I am surprised by the number of posters defending the school.
Perhaps this is some people's way of dealing with tragedy: saying that it couldn't be helped, that there was no way to avert it.
Wrong.
This situation is so bad because there's a good chance it didn't have to happen.
Some people don't want to face that. They are seeking to minimize its impact by saying it was unpreventable.