Focusing on the general idea of the last statement of your first paragraph, I completely disagree. I would much rather have a smart evil person in charge over an evil idiot.
A smart evil person will, at the very least, work for their own self-preservation. They can be negotiated with, even reasoned with, because they know that some give and take is required to meet their own goals.
An evil idiot will just break everything and take everyone with them if they don't get what they want simply because they don't understand what it is they are breaking.