Although it's become 'tradition' and 'culture' now, the reason 'moonshiners' used corn was that it was dirt cheap and readily/easily available in mass quantities without sending up easy identifiable red flags for it's purchase to the prohibition officers...
The reason it's not a 'popular opinion' is because corn is factually not a balanced and complete diet for chickens, that is the factual truth...
It's equivalent to saying you can survive on a complete diet of beans and rice, that doesn't mean it's healthy for you nor does it come anywhere near...