Largely, because they lack a proper education to recognize a truly intellectual argument, but also because of this:
"For a time is coming when people will no longer listen to sound and wholesome teaching. They will follow their own desires and will look for teachers who will tell them whatever their itching ears want to hear."
II Timothy 4:3
You are aware of that the modern world is pretty complex and need leaders?
I realize the modern world is already run by small-minded egotists who think they are so much smarter than everyone else, most of whom have ZERO morality or common sense.
That's oversimplification. The world is a complex place you need patience with people.
I'm working on it with you right now.
People just haven't got a manual to how the human machine works.