You hear the drug trade is really lucrative but you're not allowed to sell drugs, so you send your money to a contractor that sells drugs, they give you more money back, and you technically haven't "sold drugs."
Somehow, thinking breaks down at the boundary between systems, because inexplicably the constraints or guarantees of the consuming system do not propagate to the providing system.
TSA could and should be (made) identity-agnostic, with its mandate to protect vehicles and occupants. Immigration is what should care about the individual that's being allowed into the country.