The modern capitalist society is not designed to "make the world a better place". It's designed to justify the status seeking behavior inherent in mankind, and allow the few winners to enjoy their wealth without being vilified.
Want to make the world a better place? Start thinking about a steady state economy, a steady state lifestyle and a minimal consumption, minimal destruction society. That means minimizing energy usage, consumption and waste. This the complete antithesis of everything modern capitalism stands for. I'm sure this isn't gonna go over well here, as we have quite a few dyed-in-the-wool Randians, but its the truth.