My personal fear of GMO is summed up by the 'Monsanto' argument. I think GMO could overcome many of the world's agricultural problems (in terms of food supply). I don't believe there will be any greater health impacts than with non-GM food and could be beneficial for the wider environment. But unless it becomes impossible to 'own' DNA sequences, GMO for me represent a dangerous and worrying prospect, where amoral corporations will profit from human suffering.
I think the genetic ownership issue is what really got people misguidedly started on GMOs. Remember that as morally reprehensible as most people find it, the process is legal for the moment, and also shouldn't reflect on the scientific viability of GMOs. This already happens in the pharmaceutical industry every day, sadly.But unless it becomes impossible to 'own' DNA sequences, GMO for me represent a dangerous and worrying prospect, where amoral corporations will profit from human suffering.