I don't understand the lock-down mentality. Especially when it can't possibly work.
Our local high school was substantially renovated (read: "rebuilt") a few years ago. After seeing the plans, I sat down with the deputy chief of the police department to discuss the fact that the new classrooms, where the occupants are supposed to lock themselves in if there's a shooter in the building, have GLASS sidelights immediately adjacent to all the classroom doors. The chief agreed it was a dumb idea, but the police department had no voice in the design. I pointed it out to the building inspector in a meeting with him and the architects, and the architects' response was "We like it."
So they built it.