Unfortunately, a world without social crisis and conflicts among one another can only be witnessed in heaven but in earth here, so far as human race exists, there will always be fight for supremacy and since we are of different races, languages and colors, our reasonings and understanding may not be the same. Right from creation of the world it has always been violence and just like i said, a world where everyone will be at peace with one another can only be achieved in heaven not in this earth where everyone wants to feel superiority over others. The world became violent upon knowing that we won't live forever on earth but if humans were to be immortals, believe me they could have lived in peace with one another.