I will agree with Smitty. Often
the fool who follows leaves out information for his followers.
Let's take the Chicken Little story. Here we have a chicken afraid of an acorn or whatever who goes and tells everyone that the acorn was the sky. The others would have to either agree or disagree. They weren't there when the "sky" fell, so they have no first hand experience to prove or disprove.
Chicky's mistake was to think an acorn was a bit of sky.
The others mistake was believing chicken little.
Same with any number of people taken by a political revolution or a religious cult.
A fool may be taken in simply by their own trust in someone, and I think we have all trusted someone or other at one point or another who didn't deserve to be trusted.
I have known a lot of smart sounding, profound sounding fools. A fool is very often someone who has a very good plan that is omitting something very important and obvious, and if you don't have access to all the information a fool is looking over, it can sound very good.