My concern about GMO's is the monopoly companies like Monsanto have over seed production. It can lead to a lack of diversity in seeds. Even if GMO's are safe, the food tastes bad. Especially tomatoes and oranges. Modified to withstand shipping long distances, they screwed up somewhere with the flavor.
My sister sends me oranges and grapefruits every Christmas from Florida and the oranges in stores pale in comparison. Same with tomatoes grown at home... they are juicy and packed with flavor. The ones sold in stores lack flavor and are often grainy in texture.
There are also legal issues involving GMO's that have impacted farmers in S. America and India, IIRC.
https://www.who.int/news-room/questions-and-answers/item/food-genetically-modified
