Because the ONLY way in was to make entry through one door in a rack and stack.
Not.
Improvise. Adapt. Overcome.
And what’s the definition of courage again???
Exactly my thought. Schools have doors, find a steel one, knock out the pins, and you have an improvised ballistic shield. What they lacked was brains. Or balls. Or both.
They absolutely could have stacked and made entry. All of them were wearing armor too. Square up and go.
Because glass windows are so hard to break or shoot through.