Isn't the root of this problem false dichotomies? The real reason you don't get synthethesis from two opposing views is that there are omitted variables at play, that typically increase the complexity of the solution.
I would agree that's a part of it, but the idea that someone hasn't yet discovered a variable that bears impact on an issue is a far less crucial one than the ability of one's mind to disregard a salient factor as irrelevant.
Without the ability to think critically of an idea that one is endeared to though, none of that matters at all. Meanwhile, the ability to be challenged allows one to accept more variables as relevant than previously.
But you're assuming the variables are omitted due to ignorance. That's usually not the case. The people that profit from false dichotomies are using these constructs (typically) on purpose, to gloss over the ugliness of a situation otherwise, which usually involves some form of political advntage, self-dealing, or personal enrichment.
