While The Freethinking is quite simple world outlook, the vast majority of humans doesn't understand what it is. At the same time, humans has a set of simple dogmas, which could be applicable to explain almost everything. And they don't want to say these dogmas good-bye. Because otherwise they'd need to think by themselves.

What the matter? The answer could be very simple - they are STUPID, or, if to say politically correct, "mentally challenged", or, in other words, has low ID.

To cognize the world, you need an ability to bruteforce multiple combinations of statements, for example, in discussion. Every statement has to be argumented or denied. For this, another statement is neccessary. For those statements - another, and so on. And this tree isn't linear, its branches has different thickness, different weight of credibility.

Thus, human has to have high IQ level to walk through this tree and find out the truth, reach some truthworthy conclusion about anything he analyzes.

To be a freethinker is to look for this truth, throwing out any non-argumented dogmas. Freethinker should have strong "processing unit", i.e., high IQ.

And when human has low IQ, he should rely on dogmas, because can't reach the tree deeper.