Because the TSA checks boarding passes to harass travelers, not to improve security.
The airlines check BPs for revenue protection. (So that people don't resell tickets)
It's time to go with one and only one ID check (if that) at the origination of a trip and then no more after that. Any ID checks beyond the one for revenue protection are asinine passenger harassment.
[This message has been edited by Spiff (edited 06-19-2003).]