>Is it so obvious why Stirner is wrong that they don't feel the need to explain why?
>The first is life’s losing its meaning. Man loses the center, weight, and connectedness of his own life, a fact life itself compels him to realize. The phenomenon has been known for a long time. Ibsen, in Peer Gynt, puts it into a striking little scene. The aging Peer Gynt is peeling off the layers of an onion, and playfully compares the single layers with the periods of his life, hoping at the end to come to the core of the onion and the core of his own personality. But layer follows layer, period after period of life; and no core is found.
>Everyone whom this experience has touched faces the question: How can my life become meaningful? The man who lives in the fetish-making world does not see that every life is rich, full, and meaningful to the extent that it is consciously linked in human relations with other lives. The isolated egoistic man who lives only for himself lives in an impoverished world. His experiences approach threateningly close to the unessential and begin to merge into nothingness the more exclusively they are his alone, and turned solely inward.
>The man of the fetishized world, who can cure his disgust with the world only in intoxication, seeks, like the morphine addict, to find a way out by heightening the intensity of the intoxicant rather than by a way of life that has no need of intoxication. He is not aware that the loss of communal life, the degradation and dehumanization of collective work as a result of capitalist division of labor, and the severance of human relations from social activity have stupefied him. He does not see this, and goes further and further along the fatal path, which tends to become a subjective need. For in capitalist society public life, work, and the system of human relations are under the spell of fetish making, reification and dehumanization. Only revolt against the actual foundations, as we can see in many authors of the time, leads to a clearer appreciation of these foundations, and thence to a new social perspective. Escape into inwardness is a tragic-comical blind alley.
marxists.org/archive/lukacs/works/1949/existentialism.htm
TL;DR: Stirnerite egoism is just the philosophy of the alienated individual under capitalism.
Society is not made up of molecular individuals. Man is a political animal.