Because today we are governed more by: Hormonal-Medial and Mammalian Brain?

Why today, governs us more, the middle brain: hormonal, mammalian? Throughout the history of mankind there has been, there is, that the mid-brain governs us more, including in it, the hormonal-mammalian system.The question is: Why? What has this middle brain, which is so powerful in decisions, is there not another brain that is capable of having a balance between the two?If we were born with all the physical, hormonal, cerebral capacities, and also with a knowledge of good and a knowledge of evil: Why the human brain, has not been able to control, or balance the balance between two brains?What is happening?Let's start this interesting story, which to this day, is still valid.I invite you my dear readers, students and teachers, and the general public.