'He will pull out his gun and kill the poor unsuspecting first soul. After that initial shot someone with a concealed weapons permit is going to blow his brains out...'
I truly hope that maybe we work towards a society where mass shootings aren't a monthly occurrence...
Reality is a little bit messier than your fantasies.
http://en.wikipedia.org/wiki/2007_Colorado_YWAM_and_New_Life...
Ideally.
As a side note, she shouldn't shoot for the head anyway, especially if the bullet is going to go propelling out of the man. That's a great way to have unintended collateral damage.
Little old ladies with guns are typically not present in grade schools, nor would you want them to be because their weapons could be taken away from them and used against others.
Uh, we're talking about people who are frequently suicidal and are mentally ill enough to shoot up a kindergarten. I suspect they're not weighing odds in a logical manner, somehow.
http://www.policemag.com/list/tag/friendly-fire.aspx
(Do note that many of the incidents there involve an officer intentionally firing on other officers. But there are accidents there.)