I never mentioned making an arrest?… Just preventing the crime from happening because then it will be too late.
We don’t wait for a pedestrian to be run over by a car to decide that a specific road is too unsafe for a specific speed, we tend to implement appropriate speed limits to prevent such irreversible things like death from happening.
Same applies with privacy. Once a person’s data is out there, you can’t take it back anymore, so if someone every finds a way to make money out of it to the detriment of this person, it’s too late. You can arrest this someone, then the next one will pop up and do the same with the same data.