whoever said shuttles have ejection seats is wrong.
columbia used to have just two ejection seats during her
development phase.
these were replaced by standard seats when she became used for
normal space flight ops.
besides, half the crew are seated below the flight deck with no
such means available ot them even if ejection seats were fitted fo
rthe crew on the flight deck.
and yes, they would have been killed anyway if they had ejected at
that velocity.
ask a pilot if he/she feels anythign when they eject at
substantially lower speeds...