If you've ever boarded a flight in Israel, you would see why they rarely need to do personal searches. You must arrive hours before departure. Everyone on the flight is subject to intensive questioning, profiling, and a very personal interview. Your bag is x-rayed, tossed around, and you are asked to open it and report its contents. In other parts of the world, they don't take the time to perform that level of personal observation - body scans and searches are much quicker way to ascertain any security threats.