See, I was looking for the hook--where is the profit motive in doing this. and then I saw it:
Harrison's center will gather information about violence and threats against Wal-Mart and perform background checks on new employees. It no doubt also will mine the huge database of personal information the store maintains on all current and former employees, 47 million Sam's Club members, anyone who files a claim against the company or uses its pharmacies, as well as the vehicle identification numbers, license plate numbers and home addresses of those who get their oil changed at Wal-Mart.
I'll bet they've got buyers lined up for all that tasty info.
And is it too cynical to not believe the DHS isn't providing some "incentives" for doing this?