“Is it good for a creature to be smart? Ask Hamlet.
And bear in that when selection has finally finished doing its thing, it’s more than likely that the cockroach will inherit the earth. Whether a trait militates for a creature’s fitness is the same question as whether there’s an `ecological niche’ for creatures that have the trait to occupy; and that always depends on what
else is going on in the neighborhood.
Is it good to be a square peg? Not if the local holes are mostly round.”
from “Against Darwinism” – J. Fodor – http://ruccs.rutgers.edu/faculty/Fodor/Fodor_Against_Darwinism.pdf