The phrase "other party is stupid" really stood out to me, and it perfectly illustrates the problem I see. Instead of recognizing that people might have fundamentally different principles, upbringing, culture, or simply not be fully informed on a topic, the first conclusion you jump to is that they are stupid.
Have you read the entire sentence that was from? It listed pretty much what you said as an option until more information is gathered. Sometimes even people's culture/principles keeps them from seeing the truth.
I honestly don't know what you mean here, I hope you can clarify.
