Interesting that you don't put any other mammalian brains up there besides the human.
it is clearly more developed in humans than animals-- I can go into more details of neuroanatomy if you'd like to see in which ways the human brain is more developed than in animals-- including areas in which "morality" is more developed and would be more of an abstract thought in humans than just instinctual (concrete) in animals-- from hippocampus to amygdala to frontal lobe-- and what sort of animal behavior is exhibited when one of such areas is lesioned for instance Klüver-Bucy Syndrome Bilateral destruction of the amygdaloid body and inferior temporal cortex in which men end up displaying behavior observed in monkeys. We can sit here and use romanticized terms of the morality of animals, but it wouldn't cut mustard... You are certainly welcome to run your own random double blinded study with a group of animals and humans and prove common sense wrong but until such a time you are free to believe what you wish.. and we are free to write of what we know!
Yet you don't know. Your claim doesn't follow from your observations nor from your argument.
Showing that humans have MORE of the stuff that we believe to be required to have thought doesn't show that animals don't have the stuff required to have thought. It doesn't show that all animal behaviour is instinctive, which was your bold claim.
The opposite would seem to follow. If we've come to believe that the prefrontal cortex in human beings is the seat of thought and self awareness in human beings, then it wouldn't be too crazy to suggest tha the frefrontal cortex in monkeys is the seat of thought and self awareness in monkeys. They do have one you know. It may be less developed, but it is there.
Behaviour in many nonhuman animal species further suggests that they are self aware and thinking beings. Many further display empathy, self interest and socialization, three major factors in human morality.
By the way, I am more learned on neuropsychology than you may suspect. I know that if you cut up parts of the brain behaviour will change, including attitude and moral sense. I've even cut up live rat brains in a lab myself (something I regret). And I agree that it is iteresting how chemicals in the brain can account for so much of human behavior. Almost makes you wonder about the notions of the soul and free will.