As an organic CSA grower married to a conventional grain farmer, I think I might qualify to respond
I HATE Monsanto, my husband HATES Monsanto and everyone in my immediate sphere thinks they are purely evil.
I don't know about evil, but Monsanto's justification for everything they do is that the world is going to starve, and they are going to increase productivity so much that they will save the world.
I have a few problems with this:
1. They use technology that is not tested long-term enough (GMO).
2. They are aggressive about protecting their patents and go after small farmers who have genetics in their crops through wind drift.
3. They actually create seeds that have "terminator" genes in them so that when they donate pumpkin seeds to impoverished South African villages, for example, the villagers must BUY the seeds the second year.
4. They make it very difficult for organic (certified) to stay organic. Once Monsanto pollen has drifted into your organic cornfield, your corn is now "infected" and your entire crop is wasted. It cannot be processed as organic with any GMO in it.
5. They are either trying or accidentally becoming a near monopoly on seeds for the world. That is a truly terrifying prospect. When you introduce technology into seeds, you then patent that. That becomes something you can protect, not like most seeds that just "belong to the people."
6. They do not allow farmers to save their seeds and replant. You sign a contract up front that you will NOT save seeds to replant, and you will be sued if you do and they find out.
My husband, while conventional, refuses to buy Monsanto and despises them for most of the above reasons.
That said, I actually have a casual friend who is a Monsanto crop geneticist (and my CSA customer) and his coworker is another of my CSA customers. I don't get into very in-depth conversations about Monsanto because they cannot see things from my perspective and I get so angry that I have a hard time seeing it from theirs. Monsanto, interestingly, gives their employees $200 each year in credit for their employees belonging to CSAs.

My introductory letter each year of CSA lists my promises to my customers, one of which is that I will not use genetically modified crops. Take that, Monsanto customers!
