No civilization ever collapsed because the poor had too much to eat.
Did you know this was used as an excuse in Victorian times to argue women are naturally less intelligent than men?
It's not brain size perse, as it is relative brain size. And even that's deceptive. For instance, as I understand it, most of our large frontal lobe structure has nothing to do with intelligence per se; it's dedicated to the one thing human's excel at: abstraction and imagination. That co evolved with advanced tool use.
Other hunting species may have a broad cranial structure for similar reasons: you have to imagine what the prey might do to anticipate it's moves.
Anyway, brain size by itself and without qualification paints too simplistic a picture.
Be kind to your enemies. It confuses them.
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