Evolution is not a process of advancing species, only diversifying them through reproduction.
Are you a predator? A global environmental change? A solar belch of increased randomness? A thousand harmless mutations over billions of years suddenly made useful by a series of cosmic coincidences?
When is a human not a human? When one has an extra toe? Or can't see from birth? Extra ribs? A dermal melanin level not equal to yours? A fusiform gyrus formed differently than yours? Who are you to say when any combination of these will be useful, let alone deserve a different label by one particular species?
Variation is all that is necessary.
"You underestimate the character of man." | "So be off now, and set about it."