> 5) Monsanto is very legally aggressive defending its seed patents, since why would anyone pay to license their seeds if you can just steal it? Monsanto spent a lot of money developing the science for roundup seeds.

Or, alternatively: Farmer Joe plants heirloom seeds that are quite rightfully his. Farmer Bob plants patented GMO seeds, which then cross-pollinate with Farmer Joe's heirloom crop. Next year, Monsanto sues Farmer Joe into oblivion (or otherwise forces him into pay-pay-paying them forevermore) for "stealing their technology."