Just the top 3 US airports handle about 30 times the entire population of Israel in a given year.
El Al style security is not practical for the US.
Until the next plane is bombed and then the US pays magnitudes more as airlines lose money or go under as passengers decide not to fly and the government spends tons more on "beefing up security".
At the very least, everyone agrees that the TSA checks currently being conducted at airports is a joke.