I don't know the Quran as well as you seem to do, so I accept what you says it says (I'd like the reference though, because I think it very interesting).

However, what you've found is a fundamental human issue. Most people don't want to research, so they'll accept the word of anyone who seems to know more. That can mean muftis or even mere imams in islam, mediatic figures in the west, etc.

That's actually the root of religions' power. No one needs to think for themselves when you have someone telling you what's right and what's wrong.

However, in a form, that's just human laziness. And human laziness is our best asset. It's too much work to be an extremist, it's too much work to make war, and most technological progress are just ways to work less.