That the most important application of improving rationality is not projects like friendly AI or futarchy, but ordinary politics; it's not discussed here because politics is the mind-killer, but it is also indispensible.

On a more specific political note, that there are plenty of things government can do better than the market, and where government fails the people the correct approach is often not dispensing with government but attempting to improve government by improving democracy.

I know that both of these, especially this last, go against what many here believe, and I don't intend to get into a detailed defence of it here - it's not exactly a fresh topic of debate, and it's not in line with the mission for this site.