"Human" Shields

From Bartcop:

"I want to thank people for coming to work. I'm really glad to be here today."--Laura Bush, with the twins, at Citigroup in Manhattan despite the terrorist threats.

The terrorist threat was so real, Bush sent his wife and kids to act as human shields.

Just guessing here, but while Laura may have been glad to be there, I'd imagine that most of the people in the building were wishing she were anywhere else. I mean, if Citigroup is a prime target, what about Citigroup and three members of the royal family?