The most important turning point in civilization was the harvesting of seeds and grains...
Before there was even human civilization on this planet, one of the most important events was the global spread of grasses, the precursors of our harvested grains. These grasses spread all over the Earth like a wildfire, adapting and cultivating themselves to completely diverse environments.
Now imagine that someone is given ownership of seeds and grains. Grains that have no limits to where and when they could find themselves at any particular place and time.
Grains and seeds that are essential to the sustenance of life.
It's like giving someone ownership of the wind and water.
It's handing your own survival over to someone who only cares to make a profit from it.
GMO grains migrate like any other grass and grow where they weren't even planted.
If anything, this alone should be the reason to outlaw them.