The story is a powerful lesson about externalities that can arise with herbicide resistant genetically engineered crops (this one is largely negative, but note that GE Bt crops can create positive externalities). Who's to blame in this case? Monsanto for releasing GE Dicamba-resistant seed before a new version of Dicamba was released? Regulators for their slowness in approving the new Dicamba? Farmers who improperly used and applied the old version of Dicamba? You'll have to listen and form your own judgement.