fencepost wrote, "I could be wrong, but I suspect that the list mostly includes people and companies that are outside US jurisdiction..."
Thanks for expanding on your thought, because this is a false assumption. My wife, an American citizen by birth, appears on the "selectee" list of the FAA list for unspecified reasons. She is THOROUGHLY searched EVERY time she flies, and is unable to obtain an e- pass for advanced boarding in her name. We verified her status with the FAA but are unable to petition for modification through any entity. The FBI will neither confirm nor deny our "assumption" that she was placed on this list as a reprisal for failing to readily cooperate with a warrantless search they attempted to perform at her then-employer's premises many years ago.
Your assumption is overly-trusting of the U.S.government's skills AND motivation. These errors are NOT sloppy planning, nor a mistake, IMHO. They are active attempts to reduce challenging behavior and increase compliance of the public-at-large with unconstitutional restrictions.