You think that this 57 YO grandma is being used by the terrorists for nefarious purposes?
Unbelievable.
I think this 57yo grandma COULD be used by terrorists. That is why screening her is the right thing to do.
Terrorists learn. In 1993 they used a car bomb in an effort to destroy the WTC. Didn't work. The US investigation revealed that, structurally, the WTC was built to survive the impact of a jetliner. Great. When the terrorists tried again, they didn't use a car-bomb. They didn't use a jetliner. They used TWO jetliners. Terrorists learn.
If innocent old ladies are allowed on jetliners with knives, terrorists will learn from that. And at some point in the future, an indoctrinated or duped old lady will be on a plane with a knife. And she will hand it to an athletic young man with a turban.
Terrorists learn.