That would not satisfy some. El Al searches everyone don't they? Some people think they should never be searched as long as they're white, and if they are, there are howls of injustice.
El-Al also does a thorough background investigation on each passenger before they even get to the plane. They also look for the person (terrorist), while we tend to look for the weapon.
with El Al, you essentially have to prove who you are, provide enough information for your background to be checked, and why you are flying. that color coded system that we recently scrapped (mistakenly in my opinion) was a good first step towards that. it would have immediately provided a large degree of differentiation between those who could fly with just the "normal" security screen, and those that needed more. But the PC police and the ACLU (many freepers were against it also on privacy grounds) killed it.