The "cautionary tale" is that releasing GMO crops before their full impact has been studied and assessed only adds fuel to the GMO/anti-GMO fire. When it was found that bt-Corn could pose a risk to Monarchs, those in the anti-GMO camp had all the ammunition they needed to start shouting about GMOs being unsafe. When it was later found that the risk was negligible in practice, the GMO camp had all the reason they needed to continue turning a deaf ear to the anti-GMO camp.
The "cautionary tale" is that releasing GMO crops before their full impact has been studied and assessed only adds fuel to the GMO/anti-GMO fire. When it was found that bt-Corn could pose a risk to Monarchs, those in the anti-GMO camp had all the ammunition they needed to start shouting about GMOs being unsafe. When it was later found that the risk was negligible in practice, the GMO camp had all the reason they needed to continue turning a deaf ear to the anti-GMO camp.