"Israeli security succeeds by questioning every passenger. What is the purpose of your trip? Who packed your bags? Where will you be staying? The security agents are all army veterans (well, nearly everyone in Israel is), have college degrees, and are fired immediately if they make a mistake. They learn psychological profiles of terrorists as well as how to detect things like the Irish lady traveling to meet her fiance family without him. That dont smell right."
Not going get the minimum wage TSA agents to that level of competency...hence the current methods. In addition, Israel has about 1/60th of the air traffic we do...and it will not be feasible to undertake that kind of examination in this country.