Why can litigation, regulation, and reputation jointly fail in DuPont$$s case, or more broadly, in cases of environmental pollution? from the $$DuPont Case$$ in Shapira and Zingales $(2023),$Summary of the DuPont Case$$Section $2$: Discussion on the failure of litigation, regulation, and reputation in the DuPont Case $($base discussion on theories and empirical evidence $)$