"You seem to believe that by going after grannies with butter knives, TSA is keeping flights safe from terrorists."
Please quit distoring the facts for rhetorical purposes. This 'grannie' was carrying a butter knife with a serrated edge that was over five inches in length. I would remind you that the terrorists on 9/11 used weapons of much less lethality.
I would also remind you that 'grannie' could have been carrying a weapon on board the aircraft to give to a terrorist. You are aware that terrorists have used unwitting passengers in the past to ferry their bombs aboard aircraft?
I wouldn't want to show up at box-cutter fight carrying a butter knife.