I can guess.
Bush didnt want to inconvenience all of the other patrons or the management of the restaurants.
Any place that a president goes to eat would have to have the place searched by the SS, the patrons would have to be searched or removed, and no one would be allowed to enter while the president was there.
Bush cared enough about other people not to eat out.
Bingo !
Exactly! Bush has an abundance of decency that is totally lacking in the likes of Obama or any other Democrat for that matter.