When I say "Monsanto is a red herring", I mean that 90% of the time when people vilify Monsanto, they don't actually care about Monsanto. They're playing a shell game, "Monsanto is evil, therefore we should ban all GMO food crops." Hell, they barely care about glyphosate - they just don't like Roundup-Ready crops, because they're GMO.
Realistically, Monsanto is a large (but not one of the largest) corporations, and some people who work there are trying to save the world, and some people who work there are trying to make all the money by any means necessary, and most of the people are somewhere in between, just working at a job. They've definitely done some things wrong, but they're no Uber.
ADM is predominantly a food processing company; they don't really compete with Monsanto, which is a seed and chemical company. They are basically dominant players in different stages of the food supply chain. (They both have some diversification so there is probably some competition but neither is a major player in the others main markets.)
In essence:
Monsanto -> Farmer -> ADM -> food packagers
On Monstanto coverage writ large, I completely agree. The amount of excess attention and paranoia paid there is ridiculous, especially on topics where they have clear competitors like Archer Daniels Midland that people haven't even heard of.