A big concern about Monsanto GMO crops is that their genes jump to other farmer's non-GMO plants, and to wild plant populations. It's not something Monsanto can contain, it pollutes the environment and messes with the ecosystem and evolutionary ecology. Then they have the audacity to tell us what we can and can't do with their seeds (I'll be glad to tell THEM what they can do with their seeds! lol).
It reminds me of secondhand tobacco (or reefer) smoke. You can tell people not to smoke in your building, or your car, but you can't tell the secondhand smoke from elsewhere not to come into your lungs from elsewhere.