When you are more intelligent, you can see much more subtle patterns.

And so, it is easy to take to heart the adage "don't judge".
Average people see good guys and bad guys.
Calling a spade a spade, or a con a con.

Intelligent people always give the benefit of the doubt, because it is possible for someone to act like a con, but be genuine. (of course, most of the time this is wrong, but...)

With too much intelligence you will very quickly analyze a plan and see that you have no way of achieving the goal.
A less intelligent person will just start, and usually by luck, will find a way to achieve the goal.