So have a guard with controlled entry? Perfect! Now the shooter has a target rich environment waiting to get in when school starts. Or go shoot up a grocery store. Or go shoot up a night club. Or go shoot into houses at random. Or go do some drive-by shootings. Or go shoot at a birthday party. Or . .
Now what could possibly connect all the people killed this way??? Hmmmm . . . . can't quite put my finger on it. . .