Personal information is information about a person. We already collect information about things. Why not collect information about people, which are arguably more interesting?
Why don't you start the trend now? Please post here your personal details.
Many people enjoy privacy.
If your children were followed around with someone recording them with a personal video recorder as soon as they left their house, that’s just public information right?
/s
While I agree with the sentiment and am also strongly against this mass surveillance, I don't think that a "please think of the children" argument helps our case here.