The short answer is they are the most aggressive about their patents and protecting them.
Short version is they started to contribute a large amount to NPR and they get stories swayed to their point of view. How quickly we forget! NPR ran a story on Glyphosate (herbicide) resistant GMO soybeans. Monsanto said it was highly unlikely that this could lead to the creation of herbicide resistant weeds. According to the NPR story, over twenty Glyphosate resistant invasive species have been identified so far. Much in that story counters what was previously published by NPR
Additionally the fact that someone eating Roundup resistant grains and so on is in fact consuming trace amounts of Roundup.
How long did it take them do figure out DDT was unsafe to use in proximity to humans and wildlife, how long did it take them to figure out that smoking causes the damage it does?
Technology in and of itself is not the problem, application without understanding is the problem. We must be deliberate and careful, but not to the point if inaction, and not in such a way that we cede entire areas of study and advancement.
Here's a CBS report refuting that Monsanto doesn't sue farmers
http://www.cbsnews.com/8301-18563_162-4048288.html
It is true that GMO pollen will not make your crop uncertified, but "organic" is not a USDA construct, it's the construct of a grass roots movement and the grass roots say crops contaminated with GMO genes are not organic despite the USDA's not regulating it thus. The real problem with this article though is that it singles out only the negative myths about GMOs for debunking. What about the positive GMO truths?
That's why this is propaganda rather than journalism. In just five simple minutes of surfing I found numerous stories refuting the claims made in these articles. and how monsanto agents lied and used political pressure to protect thier patent even to the point of breaking the law.
I am not a nuclear physicist, but play one on the internet.