Need to wake up? How about FIRED, LOSS of certification? There can't be a school in this country that has unlocked doors now. And if it was locked, and then a janitor or teacher unlocked it (mistake or not), sorry....FIRED and LOSS of certification. This isn't a case of forgetting to put gas in your vehicle and then letting your kid take it and run out of gas. This was lives lost that shouldn't have been.
Before people start pointing the finger at the police response and quickness of it, the HOW question is the one that needs addressed first.