Blame whoever you like. If we agree an activity is harmful, we usually pass laws to stop people doing it. Other options can be applied, but only really if we d

Blame whoever you like. If we agree an activity is harmful, we usually pass laws to stop people doing it. Other options can be applied, but only really if we don't agree, usually due to personal choice being relevant (some drugs, prostitution, seatbelts and helmets) or non-linear effects in both the utility and externalities (most pollution). Or both (cigarettes, alcohol, sugar).