If living life for someone else is what life is about, then there would be no concept of individuality. It would be others’ life, not yours.
Exaggerated humanity would wipe out the meaning of living your life for yourself.
But extreme selfishness would diminish the existence of humanity. Hasn’t enough damage already been done?
The decision lies upon the shoulder of every person. How much weight should someone give to their personal way of life, for themselves and the life they spend for others?