Nonsense. Actually, without going into details, I am VERY well trained in the tactical use of firearms.
I assume by “locked access” you mean teachers have them locked in a drawer. Most teachers I know would not want to have anything to do with this, let alone taking them home at night.
So.. the first thing the intruder does is run into the classroom and shoot the teacher, who is desperately trying to unlock the drawer. (Don’t assume the alarm bells have gone off when the person walked into the school, at least not in time).
If the teachers want to have a gun locked in a drawer fine, but that should not be the first line of defense. That should be unexpected armed defenders showing up anywhere in the school. It’s a bit like criminals being worried that a house they are planning to invade has a gun... but not knowing which ones, or hijackers on a plane wondering which passenger is the armed sky marshal.
I assume by “locked access” you mean teachers have them locked in a drawer. Most teachers I know would not want to have anything to do with this, let alone taking them home at night.
As am I...to your first response.
To your second, if the parents entrust the well being of their children every day in school with the teachers/administrators, why would they not trust a teacher/administrator, carrying a concealed weapon, to protect their children if need be (using deadly force)?