The reluctance on a personal level is puzzling to me. I get it, some argue the merits of the legal aspect, great, argue away, I might agree. But standing on privacy is pointless as there are provisions to keep all but the names private. My own worry, the address of others (I assume mine can be found with even a novice effort), is resolved via a Brown PMB. Managing the data of others, is resolved by requiring each to register personally, and giving me their number (so I have no idea or responsibility for the address or information they enter).
And to be clear, I have been threatened by a nut, who is spending the rest of their days at a federal facility, and said nut was able to find my personal information, even though it was not on any company documentation at the time. Privacy is as gone as the one income family with three kids, two cars, and a paid off home.