Human beings have never known what the best life is  In fact, if they guess, they certainly do not know how to achieve the best life  Even if they happen to guess something and realize the best living conditions, they will not be able to do it
This is an incredible fact, but it is true, basically, because the good deeds of mankind require universal cooperation, and the shortcomings of human nature always make any universal cooperation come to naught
Only universal cooperation can achieve a better life for mankind