If their parents have raised them well, they'll think that while a "lockdown" may be a necessary evil in today's society, the extreme extent of it was wholly unnecessary and offered no additional security than would have been afforded had they simply closed the shades and locked the exterior doors while going about daily school business. And that the woman who "saw a gun" was a blithering idiot.
If their parents have raised them poorly, they'll be thanking and praising the town sheriff for decades to come for saving them from the horrible, gun-toting monster who could have targeted their school for a massacre.
Heaven help this poor lady and this town had they seen my grandfather toting his shotgun back and forth from elementary school every day. They'd have thought the Germans had started WWI five years ahead of schedule.