You're right that monocultures are a dangerous way of producing food, but I almost never see that criticism made in forums for non-technical audiences. The popular discourse is absolutely focused on GMOs-as-carcinogen.
Also, I've never entirely understood all the venom directed specifically toward Monsanto. There are a handful of other companies doing basically the same thing. Where's the hate for Cargill?
Cargill and ADM are just as bad. Monsanto gets most of the public vitriol for its vile lawsuits against small farmers for unwillingly growing their genetically modified shit. Kind of like having someone who infected your computer with malware then suing you for patent infringement.
My guess would be that Monsanto has show itself to be a overly litigious, generally "evil" corporation. While it does not pertain to GMO crops, look at what they did in Anniston, AL. The effects are still quite visible even today.
Disclaimer: I live in Anniston
Also, I've never entirely understood all the venom directed specifically toward Monsanto. There are a handful of other companies doing basically the same thing. Where's the hate for Cargill?