Luddites. Why this particular crop? Was it wheat?
No maize is grown commercially, in the EU, which is not genetically modified, the same applies to large scale growing elsewhere, it's used in many food products and it's a fair bet that these people eat it every day or most days. No problem there. Maize didn't exist as a wild plant anyway; it's a fine example of early 'genetic engineering' by selective breeding from parent stock from the wild, thousands of years ago. We can produce the same or better results by modern genetic engineering. That we can make livestock and crops better more quickly is hardly an objection. But we give ourselves problems with monoculture however we get the product; we don't plant the same variety, or the same plant, all the time, everywhere, lest it is peculiarly susceptible to some pest or disease which gets established and we lose the lot .
If our predecessors could create a variety which was resistant to a pest or disease, they did, as glance at the vegetable and fruit catalogues for allotment holders and gardeners soon reveals. This or that variety is proclaimed over the years as better at resisting something or other; that even applies to garden flowers, such as clematis and roses. The aphid-resistant rose would be good, except for the ladybirds. Aphid -resistant food crops are an even better idea, however achieved.