But you better have a steep learning curve and don't keep beating your head against the wall if it doesn't budge. And if people beat their heads against arguments without learning, deny that logic applies to them, and then go out and actually hurt themselves doing those things that lack logic, then I have to say that there is a serious lack of perfection in such brains. This leaves out a lot.
Most birds have a poor sense of smell, just like humans, yet get along just fine.
I don't see anything inherently abnormal about a large brain. More on that below. Humans without rational control of their instincts are not viable, I don't think that this is everyone. What you are describing to me is the balance of energy in nature. I have no problem with that.