"We need your id to put your name on the passenger manifest" "The manifest is required by law" "We can't just put your possibly-fake name on the manifest beca

"We need your id to put your name on the passenger manifest" "The manifest is required by law" "We can't just put your possibly-fake name on the manifest because then we'd be committing a crime" Combinations of other rules probably effectively require it, even if nonsensical.