Because there aren't any. Although I would not use the word "sane" here, I would use the word "capable", as in capable of running a political unit the size of a country. The inconvenient truth that nobody wants to acknowledge is that there are no human beings capable of doing that. Countries are simply too big and too complicated. (This is actually true IMO for units much smaller than countries, but countries is the current level of discussion.) The problem is not to find someone who can govern a country sanely; the problem is to figure out how to organize ourselves and coexist given that nobody is capable of governing a country sanely.
Because there aren't any. Although I would not use the word "sane" here, I would use the word "capable", as in capable of running a political unit the size of a country. The inconvenient truth that nobody wants to acknowledge is that there are no human beings capable of doing that. Countries are simply too big and too complicated. (This is actually true IMO for units much smaller than countries, but countries is the current level of discussion.) The problem is not to find someone who can govern a country sanely; the problem is to figure out how to organize ourselves and coexist given that nobody is capable of governing a country sanely.