>someone can't be smart (have large brain power) if they also don't understand the value of altruism and ethics for their own well-being

I would agree with this. And to borrow something that Daniel Dennett once said, no moral theory that exists seems to be computationally tractable. I wouldn't say I entirely agree, but I agree with like the vibe or the upshot of it, which is a certain amount of mapping out. The variables and consequences seems to be instrumental to moral insight, and the more capable of the brain, the more capable it would be of applying moral insight in increasingly complex situations.