Largely because I know folks who perform them.
The crew background check is nothing. Call me when they call your mother, father, friends, family, neighbors, teachers, and the kid who babysat you decades ago.
Wrong. It's required for my job. I'm unaware of commercial transit over oceans that does not involve airplanes. I'm unaware of how to get from the west coast to the east coast in under 12 hours without the use of an aircraft.
That does not permit one to cut the line.
Which either a greater security threat than people who have been screened to a more severe degree, particularly as it pertains to their background.
Stop whining about trying to do something that nobody promised you when you took the job and I'll stop whining about being less of a threat, kay?