> You fail to account for the possibility of unknown unknowns, and again you're displaying biased cognitive dissonance.
I will discuss unknown unknowns later on. Firstly, in terms of cognitive dissonance, I believe that the charge is premature. You seem to have missed the fact that he was referring to himself as one of those researchers, and he most certainly did not mention LD50 profiles. A quick check of his profile:
> I'm a synthetic biologist. I did some of the early work in optogenetics as a student. Now I work on industrializing the genetic engineering of cells.
It seems unlikely to me, given that context, that he routinely simplifies the topic too much.
Your questions about glycine, protein structures, chelating, and shikimate might be really good ones. I wouldn't know. However, your preamble provides a strong disincentive to answering them.
In terms of errors in reasoning, confirmation bias, and cognitive dissonance, I wonder if this is a common reinforcing structure; that is, if people generally prefix questions with a preamble hinting at the permissible responses in order to ward off the experience of cognitive dissonance. I might do it myself. That's just a passing thought. Concretely, regardless of motive, you've signalled to him quite strongly that any answer he makes will be futile, for persuasive purposes, and probably pissed him off a bit.
> You are running with the base assumption that Monsanto is benevolent and honest. This is where your cognitive dissonance stems from.
Your conclusion returns to the theme of rejecting what he has to say. His very first sentence was literally "I'm not asking you to believe anything from Monsanto." Having demonstrated that you will not pay attention to what he says, you then reaffirm that anything he says contradicting your opinions is the result of cognitive dissonance. I do not think that anyone who was paying attention to your words would, at that point, bother to reply.
With regards to "unknown unknowns," you should appreciate that you are speaking to a domain expert. By contrast, you are reasoning through a trust calculus on first principles. That's fine, but he has education and experience that represent a multi-generational attempt to address those "unknown unknowns". Detecting unknown unknowns and turning them into known unknowns is one of its primary occupations. It is manifestly erroneous to equally weight the "unknown unknowns" with "everything else" at all points and times, especially if that means privileging them over known unknowns.
You appealed to Occam's Razor in your previous comment. Here we have a dispute about material fact between a genetic scientist and a (known unknown) random person on the internet, regarding the risks of a substance as a carcinogen. I want to stress again that that's fine. However, I think it would benefit you to be self-aware enough to realize exactly which resolution of the dispute Occam's Razor suggests to your audience. If you demonstrated such awareness, you might be taken more seriously.