The bottom line is still the same, large advances in society and modern comforts are derived from human self interest. You might do well to educate yourself:
I've read the book. You may be extrapolating a bit too far if you think self interest is the foundation for modern civilization, its affordances, and the high life expectancy.
EDIT: Said another way, your analysis appears reductive to the point of absurdity. Modern societal advances require a lot of collective action and self sacrifice.
This line of argumentation is just a cope to fend off discussion of negative externalities which spring from the same root. It's like showing up at the funeral of a pedestrian to extol the virtues of the motorized hearse.
https://en.wikipedia.org/wiki/The_Selfish_Gene