[cortesoft]

I think you are quite wrong about the "Nobody's privacy is violated by saying that person X exists and looks like Y."

For one thing, you are leaving out the part that says "and doing Z". There have been lots of cases of people having tagged photos be used against them. While you might be fine with the cases of someone being tagged at a baseball game when they said they were sick from work, but what about when someone is tagged at a gay pride parade and they live in a homophobic area? Or being tagged in a picture of a protest when they live in an oppressive country?