True. Proving damages by externalities is very hard unfortunately. For example I remember a case where foresters around here tried to sue coal companies for t

True. Proving damages by externalities is very hard unfortunately. For example I remember a case where foresters around here tried to sue coal companies for the acidified rain which killed a lot of pines and saplings and cost them a lot of money. The courts denied any compensation because they should have known acid rain was a risk and they could not prove which sulphur compound molecules originated from which company. And I suppose courts would treat misuse of personal data the same.