Boing Boing: Why can't Homeland Security tell the difference between Al Quaeda and my six-year-old daughter?

Over at Boing Boing Mark Frauenfelder wonders why his 6-year-old daughter needs to be submitted to mandatory secondary screening.

My daughter was scared and shaken up by the ordeal and told us that she "hated it." At least the security people were polite to her. But they were like polite robots, unable to laugh at the fact that someone had mistakenly pegged a little girl as a potential terrorist. No, they insisted that she had to take off her shoes and get patted down and have a wand passed over her body and have her Hello Kitty suitcase opened and examined with a fine toothed comb. When we got to the gate, I looked at one of the monitors, and I saw Sarina's name on the list, along with one other person's name. The list was titled "CAPPS."

There are so many of these stories out there. Why can't the department of homeland security get this stuff right?