Those diplomats who are they are "clean", shouldn't complain about security measures that lead to a delay in going from one place to the other. They perfectly know there is a permanent threat from Palestinians and other terrorist groups and that should be minimized whether they like it or not. Those who complain about delays must probably have something to hide.
A very good reason- perhaps if these diplomats would press upon their countries to condemn the activities of Hamas,Jihad Islam etc. They wouldn't be held up- or better still they could go and get a real job.