Profound elitism and non-democracy are evolutionary advantages.
I prefer democracy to whatever it is that you're promoting. (It reminds me of an adolescent version of Nietzsche.)
You seem to be assuming that belonging to an elite corresponds to evolutionary fitness. That's not a given. If members of an elite have to struggle constantly in order to maintain their elite status, then elite status might be a handicap in evolutionary terms.
And elite status would presumably only be of benefit to members of the elite. It wouldn't be of any benefit to the majority of the population. So it would be in everyone else's interest to oppose those elites who presume to rule them. That general opposition would be another disadvantage of elite membership and the resulting resentments might undermine social stability.
No matter how you look at it, humanism is an outlook that nobody can afford in the long run.
If this life is all there is, if there is no God who would have humanist sensitivities, no karma, no rebirth, then all that matters is getting the upper hand.
You seem to be imagining that evolution operates on the level of individuals and favors individual predators with the largest possible teeth. But do human beings look like that? Humans seemingly acquired their current success as a species by their ability to adapt to new lifestyles and to cooperate together in groups. We see examples of group cooperation conferring evolutionary advantage throughout the living world, in all manner of animals, plants and bacteria.
Your vision of society ruled by Nietzschean '
Ubermenschen' doesn't sound like any kind of world that I would want to live in.
Historical note: The ideal of democracy arose in the ancient Greek city states, in Athens particularly, during a transition in battle tactics in warfare. The earlier Greek city states were aristocratic. The aristocrats were the warriors and cities would send out their strongest and best on chariots to battle the strongest and best of other cities. (Think of the legends of Hercules.) And inevitably, power resided with these aristocrats in peacetime.
But as time went on, the cities adopted new tactics, particularly the use of the massed phalanx. This was a formation of foot soldiers, shoulder to shoulder, marching and moving in unison. Armed with shields, swords and pikes, with reserves behind them ready to fill any gaps as men fell, it was almost invincible on the ancient battlefield. None of the old elite champions would stand a chance against them.
But as the general public, at least the able bodied male citizens among them, were conscripted into military service, they expected and demanded the rights and privileges enjoyed by the earlier military aristocrats in their shining armor on their chariots. So the ideal of popular rule emerged, where the people who were called upon to put their lives at risk for the city made decisions for the city en-masse in popular assemblies.
So democracy has been associated with what we might call evolutionary fitness since the very beginning. Democratic Athens rose to dominate all of Greece after the Persian wars because all of its citizens felt that they had a role and a stake in its success. They were
citizens, not
subjects. The life of the mind became established first and foremost in Athens because, at first, people sought instruction in rhetoric and in how best to sway their fellows in speeches. Then people like Socrates, Plato and Aristotle appeared, who questioned what the goals of all this 'sophistry' should be and inquired into what the long term goals of the city, civilization and human flourishing should be.
https://en.wikipedia.org/wiki/Eudaimonia