And who's ideas would prevail, hm? Yours? You want to be dictator for life and kill all disbelievers? Like, the Spanish Inquisition?I strongly disagree with that.
You don't need people holding stupid, idiotic viewpoints to have a diversity of views. If we could do away with the zombie lie that AGW science is unreliable, our world would be a far, far better place. The same is true if we could do away with a wide variety of other superstitious or anti-science views. This would absolutely not eliminate all disagreement: there are a wide variety of views that are simply not up to the evidence (such as whether pizza tastes better than hamburgers), and there are a large number of things where the evidence is not yet settled. Plus even if we could be transported to a magical world where everybody could be convinced based upon evidence (unlike Frank and corduroygt), people would still be routinely mistaken due to a lack of knowledge.
So no, idiocy does not serve a useful function at all. There will be diversity with or without idiocy. And if we got rid of the stupid viewpoints, we could have much better discussions between competing intelligent ones.
Most dictators try to kill all intellectuals, as they make things difficult to run. Differing opinions are punishable by death!
Here is a hint: become a Muslim, and emigrate to Saudi Arabia. You will never be irritated by disbelievers ever again, as they simply receive the death sentence without much hassle.
And remember to be faithful at all times, or the same might happen to you!