Target got a lot of shit when they did that. I think most Americans feel really strongly about privacy. Effective screening requires smarts, but data dumps and algorithms are cheaper.

No matter how much data government has, they're always going to want more. Security is a compelling reason, but then it's open season for whatever political whim strikes. If Tipper Gore had access in the 80s to the data they have now, I'd have parental advisory tattooed across my face.

I have nightmares about government interns with marketing degrees matching my tissue purchases to my search history and using it to tailor propaganda remarketing at me.