A lot of early information released turned out to be false, but I remember one piece of info was particularly disturbing - an LEO from "some" agency wanted to go in and get the active shooter, but other LEOs at the scene physically restrained him and disarmed him, preventing his entry.
One variation had it that this LEO had a child of his own inside the school.
IF this is true - and given the nonsense that came out initially I don't know that it is - THAT officer would seem to have a cause of action against those who prevented him from doing his job, and in fact, those who actively prevented him from going to help the kids in danger ought to be cited as accessories to the murders, since they were acting as a security detail for the killer.