Because Rodney, it's not in human nature. We'll continue to kill each other until the sun turns into a giant supernova and the Earth is burnt to a giant cinder. In fact, that last space ship to leave a dying earth thousands of years from now will leave behind a mass of rioting assholes trying to get on the spacecraft. That's if we haven't killed each other off before then.
Just another uplifting, hopeful and optimistic Funny Foto Friday!