Definition of a zero sum game:
A situation in which one person or group can win something only by causing another person or group to lose it
And myriads of instances where helping others makes your life better. In-fact, not to help other people is unequivocally a horrible and myopic decision. For starters, we need exponential number of scientists to keep making linear progress. Furthermore, paying taxes which are used to fund education results in lower criminality [1]. Furthermore, we have that investing in education can give back a 5x ROI [2].
[1] https://www.researchgate.net/publication/4901649_The_Effect_...
> For example, it is now generally acknowledged that for heart disease—the nation’s leading cause of death—emotional stress is a major risk factor, equal in importance to other such recognized risk factors as hypertension, cigarette smoking, elevated serum cholesterol level, obesity, and diabetes. Stress also has been recognized as an important risk factor in high blood pressure, ulcers, colitis, asthma, pain syndromes (e.g., migraine, cluster, and tension headaches; backaches), skin diseases, insomnia, and various psychological disorders. Most standard medical textbooks attribute anywhere from 50 to 80 percent of all disease to stress-related origins.
https://med.stanford.edu/survivingcancer/cancer-and-stress/s...
[0] https://www.cancer.gov/about-cancer/coping/feelings/stress-f...