I've defended Monsanto repeatedly on HN (there are some extraordinarily popular beliefs about Monsanto that turn out, from what I can tell, to be just completely false, and they used to wind up here a bunch). I'm not carrying any water for them. I'm pro-GMO just in principle, but neutral-to-skeptical about any company of Monsanto's size. I'm sure the company itself is perfectly amoral. I'm just calling actual issues like I see them.
Naturally, plenty of people on HN think I'm a paid shill (what makes this funnier is the company I founded and worked at for most of my time on HN was named "Matasano", which was so frequently confused for "Monsanto" that we put a sign on our window about it in our Mountain View office).
My point is just: your intuition for whether comments are paid shillage are likely to mislead you.