Sanity Soapbox, your argument simply does not exist at all. It is a non-argument, it not only has ceased to be but never was. It's a statement of an empty belief with no thought behind it whatsoever.
For the hard-of-thinking, here's a brief summary of evolution:
A random change occurs to the offspring of a lifeform compared to its parents.
That change will either be good for the offspring, bad for the offspring or make no detectable difference.
- If the change is good, it is more likely to survive and have offspring of its own, thus the descendants also have that particualr change and over time it becomes more common.
- If the change is bad, it is less likely to survive and have further offspring, thus the change will be rare or be lost entirely.
- If the change is indifferent, it has the same chance and so the change may be retained.
It's clear that given time, "advantageous" changes will accumulate (opposable thumbs, better eyesight...) and a variety of "harmless" differences will appear (freckles, hair colour...).
It's also clear that as the environment changes, the definitions of Good, Bad and Indifferent will also change.
Perhaps making something that was previously Indifferent a Good or Bad thing, or even something that was Bad (no eyes) Indifferent or even Good (it's now in a dark cave and needs less food than its eyed cousins), and vice-versa.