All humans have equal capacity to think. Their machinery itself is made in such a way that they think. Problem solving and intelligence are high in few, but no one is completely devoid of thinking capacity. Like finger prints, thinking patterns are different. Thinking patterns are subjective. Conflicts arise because, humans basically cannot follow irrational rules. That is the reason why they suffer when they are made to follow rules that are irrational and that are not from their own mind.
So every person should be allowed to think and take their own decisions. Especially children should be encouraged when they think and ask questions.