The fact that some people think there are ethical and moral issues related to GMO crops affects society mainly by reducing the amount of food that is available. If people did not fear GMO crops, these crops would be more widely grown and society would benefit.
Many people worry that genetically engineered foods are not safe for human consumption or that they will manage to contaminate the environment by breeding with other plants. These people fear that there has been too much of a rush to allow GMO because of its economic benefits. This becomes a moral or ethical issue because it pits A) economic benefits against potential health and environmental concerns and B) immediate benefits against possible long-term ills.
These moral and ethical questions, then, reduce the amount of GMO being grown in the world. Therefore, they reduce the amount of food available to people.