I guess in the end we differ on the point of whether primitive forms of this eye pattern could have come about and be selected over other patterns of the butterflies. I don't see that happening while you guys do and that's the difference in our reasoning.
By the way, I found this guy while doing some research, and find his views interesting.
http://en.wikipedia.org/wiki/Simon_Conway_MorrisSimon Conway Morris FRS (born 6 November 1951) is an English paleontologist made known by his detailed and careful study of the Burgess Shale fossils, an exploit celebrated in Wonderful Life by Stephen Jay Gould.....
Conway Morris suggests:[5]
Evolution shows an eerie predictability, leading to the direct contradiction of the widely-held view that insists on evolution being governed by the contingencies of circumstance
Eyes are not the only example of repeated evolutionary convergence on the same solution. There is evidence for fundamental equivalences of sensory perception and the implication that deeper in the nervous system there is only one mentality. Minds may be not only universal, but also the same.
Evolutionary convergence can give us some very strong hints as to how any aliens will sense their environment, how they will move, how they will evolve agriculture, and intelligence.
Humans have passed a threshold that means we now transcend our animal origins. But birds, whales and humans all converge in song, and far from being the pinnacle of Creation we may be mere juveniles.
The regularities of the physical world he mentions the Euclidean geometry of three dimensional space or the three degrees of freedom shown by terrestrial illumination, and citing Roger Shepard, that there must be universal principles of mind. The evidence from evolutionary convergence, not least in terms of intelligence and music, is that the trajectories towards consciousness are embedded in a universe that in some ways is strangely familiar, where personal knowledge (to use Polanyi’s phrase) is valid.
Any attempt to explain, entirely in naturalistic terms, the fact that universe can now understand itself seems doomed to failure. Not only is the Creation open-ended and endlessly fertile, suggesting that in the future science itself faces an infinity of understandings, but so too there is good evidence of realities orthogonal to every-day experiences. Rather than trudging across the arid landscapes skimpily sketched by the materialists, we need to accept the invitation and accompany the Artist that brought Creation into being.
He is a strong critic of materialism and of reductionism:
That satisfactory definitions of life elude us may be one hint that when materialists step forward and declare with a brisk slap of the hands that this is it, we should be deeply skeptical. Whether the “it” be that of Richard Dawkins’ reductionist gene-centred worldpicture, the “universal acid” of Daniel Dennett’s meaningless Darwinism, or David Sloan Wilson’s faith in group selection, we certainly need to acknowledge each provides insights but as total explanations of what we see around us they are, to put it politely, somewhat incomplete.[2]