The first sentence is an unsubstantiated assumption and, as a parent, I can tell you it's wrong. The less a child knows, the less context they have, so the less room you have to negotiate an agreement. Plus, their knowledge level is intimately tied to their memory span, their language, their capacity to understand their own emotions, and all the things you and I still grapple with, but at least we have more context and language. And even then, if you subscribe to the ideas of George Lakoff, our life experience may be sufficiently divergent that we still can't arrive at an agreement. I think that divergence is what led you to make the original statement, that the less you know the easier it is to reach a simple agreement. It's tempting to follow that one variable, divergence of life experience, back to a singularity, but that neglects the many other variables at play in real life.