You asked why somebody would think that the right to privacy is applicable in this situation. There is ample material describing why they might think that, incl

You asked why somebody would think that the right to privacy is applicable in this situation. There is ample material describing why they might think that, including a Supreme Court judgement. It's not a difficult position to understand, regardless of whether you believe that view or not. The existence of other material, including a later judgement, supporting the view that this isn't the case does not invalidate other views.