I realize that "bash the USA" is a popular viewpoint to hold on this particular forum, but you must understand something before you blindly criticize this policy. The purpose of the policy is to prevent a hijacker from entering the cockpit and causing harm to people on the plane or on the ground. If the US was to exempt foreign carriers from this rule, and then a hijacker took over the foreign airplane and slammed it into a building in the US, everyone would be calling for the government's collective head.