Well, it's not annoying to Australians. Fighting in other people's wars is a sad part of any commitment to freedom. But I'll tell what is annoying: being told by an ally with whom we fought in WWI, WWII, Korea, Vietnam, Afghanistan, Iraq, you name it, that because of ridiculous paranoia we can't queue for the toilet on flights to your country.
What are your qualifications to judge these actions "ridiculous?" Homeland Security, FBI, CIA, FAA and others spent a lot of time and brainpower assessing vulnerabilities. I know for a fact that some of our best SpecOps guys gamed the system in Red Cell exercises to see what they could accomplish if they had been terrorists.
That kind of analysis has driven the security measures we have taken, and, if the reasons are not immediately obvious to you, that's too bad. You do not have "need to know" for every detail and rationale behind our counterterrorist measures. You have a choice: Comply with the conditions, or stay out of my country.