Don't call it "Security", it is security theater.
The "security" is soooo stupid that they will let you on the plane with the worst weapons you can think of... but box cutters, oooh, scary.
Further, the planes are cleaned, loaded and fuelled by low wage workers. Usually immigrants. Of the type that who have been focussed on for blowing up planes.
The security theater is just to get people used to embarrassing searches and loss of personal liberty.
It's one of the reasons I am glad I won't fly anymore. Copenhagen Airport is even one of the most anal in the world. I must say that the South Africans took it all a bit more relaxed!