*
sigh*
Considerations of
future "ifs" are sometimes quite productive, but this wasn't the sort of "if"s you were presenting. Yours "ifs' were all about changing past conditions:
". . .if either the principal or psychologist, or anyone else on that staff were armed, someone could have . . "
"if Lanza's mother never had a gun,.
Speculation about what the past
would have been, are pointless, because all kinds of differing "
ya, but. . . .s" can be asserted almost ad infinitum. It's a fruitless child's game.