That is certainly a noble sentiment however from a practical point of view I doubt that you would have any effect considering that they are a massive company employing 33,000 people around the world.

Also, the culture is set from the top-down so unless your plan is to penetrate Goldman Sachs with a fifth-column cadre that would somehow climb the corporate ladder continuously - while miraculously not losing sight of their real goal! - to one day be able to enact change from the top down, I don't know how you could possibly succeed in making even the smallest dent from your position as a corporate 'peon'.