I do not think everything which is considered polite is bad (such as careful criticism and minimal insults), I was just trying to show that it covers a wide range of behaviors, some of which suppress rational debate. I agree with the rest of your points, but even if society currently works that way, I still wish people’s happiness was not affected by winning (or avoiding losing) arguments. Perhaps my resistance to social norms is hopeless, but intelligent criticism improves my perception of reality, and I appreciate others doing it in the fastest way possible.