Humans have a very high potential to do great things. But having said that, the outcomes of our actions are very volatile. Some individuals can make a huge impact, while others amount to doing really dumb things. Humanity as a whole can be the cause of our own destruction, but we can also pave the way for reaching new heights and improve the lives of others and those to come. Human potential can be awesome or downright superficial, but to say that all of those outcomes are up to chance is grossly underrating that human potential.
Such is my interpretation of what goes on in this anime.