OK, consider this ......... Do you really think [for even a second] that she went to work that day, with even a miniscule inkling that some whack-job kid was going to storm the school to take lives ? She goes out a door to retrieve [something] perhaps does not have a key, to that door that locks automatically, and blocks it open for just a few seconds ....... She is not the devil ..... she is as normal as anyone here.
Most people do not live in a negative world, with constant evil on their minds. Most live in a positive world , and [even though it has happend before] they just cannot conceive of such a thing.